Amazon offers the Polk Audio PSW505 300-watt 12" Powered Subwoofer in Black, model no. PSW505B, for $179.99 with free shipping. (newegg charges the same.) That's $10 under our December mention and the lowest total price we could find by $50. It features a frequency response of 23Hz to 160Hz, automatic on/off switch, magnetic shielding, adjustable crossover, phase switch, volume control, and more.

Best Buy offers John Adams: The Complete HBO Television Series on Blu-ray Disc for $17.99 with free shipping. (Amazon charges the same for Prime members.) That's a buck under our December mention and the lowest total price we could find by $8. This 3-disc set includes all seven episodes, a Making of John Adams featurette, Facts are Stubborn Things on-screen historical guide, and more.

Best Buy offers the Hamilton Beach Deluxe Food Chopper, model no. 72705, for an in-cart price of $19.98 with free shipping. (Amazon offers it to Prime members for the same price.) That's the lowest total price we could find by $22. It features a 3-cup bowl size, small batch tool for chopping herbs, 1-touch pulse control, oil-dispenser opening, and more. It includes a custom spatula.

Amazon offers its Prime members the GAME Underwater Light Show, model no. NA413, for $14.64 with free shipping. (Non-members can get free shipping on orders of $25 or more; otherwise, shipping adds $5.74.) That's the lowest total price we could find by $6, although it was pennies less in April. This pool party accessory feature seven patterns and colors. It uses three AA batteries (included).

River Road via Amazon offers Prime members the Cuisaid ProDigital Digital Kitchen Scale in Black Chrome, White Chrome (pictured), or Silver, model no. ZK12, for $9.99 with free shipping. (Non-members can get free shipping on orders of $25 or more; otherwise, shipping adds $5.78.) That's $60 off and tied with our mention from two weeks ago as one of the best deals we've seen on digital kitchen scales. It features an LCD display, maximum capacity of 11-lbs., and more. It uses two AAA batteries (included).

Amazon offers the Audio-Technica Professional Studio Headphones in Black, model no. ATH-M50, for $101.98 with free shipping. (B&H Photo-Video offers it for the same price.) That's tied with our mention from last week and the lowest total price we could find by $8. These collapsible headphones feature a 15Hz to 28kHz frequency range, 45mm neodymium drivers, swivel earcups, a padded headband, and coiled cord.

Amazon offers the AOC 16" LED-Backlit LCD USB-Powered Monitor, model no. E1649FWU, for $89.99 with free shipping. That's the lowest total price we could find by $10, although we saw it for a buck less last August. It features a resolution of 1366 x768, LED backlight, 500:1 contrast ratio, 200 cd/m² brightness, 16ms response time, and USB connection.

For its newsletter subscribers, newegg offers the the Acer X1161P SVGA 3D-Ready DLP Projector, model no. EY.JBU01.009, for $279.99. Coupon code "EMCXRWS266" cuts it to $249.99. (Amazon charges the same.) With free shipping, that's tied with our February mention and the lowest total price we could find by $49. This 3D-ready projector features a 800x600 native resolution, 4,000:1 contrast ratio, 2,700 lumens brightness, and VGA and other video inputs. Coupon expires May 20.

newegg offers the the ASUS N900 802.11n Dual Band Wireless USB 2.0 Adapter, model no. USB-N66, for $64.99. This $20 mail-in rebate cuts it to $44.99. (Amazon charges the same, also after rebate.) With free shipping, that's tied with our mention from two weeks ago and the lowest total price we could find by $2. It features a data transfer rate of up to 450Mbps, 3-point orthogonal antenna design, and more. Rebate expires May 31.

Amazon offers its Prime members the Fisher-Price Happy Days & Nights Size 4 Diaper 140-Pack for $29.97. Clip the $5 off coupon on the product page to cut the price to $24.97 with free shipping. (Non-members can get free shipping on orders of $25 or more; otherwise, shipping adds $9.49.) At $0.18 per diaper, that's the lowest total price we could find for this quantity by $6.

Walmart offers the Bradley Digital 4-Rack Smoker, model no. BTDS76P, for $359.98. Opt for free Site-to-Store pickup to dodge the $14.97 shipping charge. (Amazon charges the same with free shipping.) That's the lowest total shipped price we could find by $17. It provides eight hours of smoke time and features a digital control for temperature, time, and smoke.

Discount Tommy via Amazon offers Prime members a selection of RAD Sportz Speed Training Resistance Parachutes starting at $8.95, as listed below. Even better, all parachutes qualify for free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping starts at $5.58.) That puts each at the lowest total price we could find by at least $6. The parachutes (which look like you are being chased by a jellyfish) feature 15 lbs. of resistance and a carry bag. Each fits waist sizes from 20 to 42 and purports to increase running speed and improved stride length. The deals:

• RAD Sportz 40" Resistance Parachute (pictured) for $8.95
• RAD Sportz 48" Resistance Parachute for $9.95
• RAD Sportz 56" Resistance Parachute for $10.95

newegg offers the GIGABYTE NM70 Intel Celeron 847 Mini-ITX Motherboard, model no. GA-C847N-D, for $74.99. This $20 mail-in rebate cuts it to $54.99. (Amazon charges the same via rebate.) With free shipping, that's $5 under our mention from two weeks ago and the lowest total price we could find by $25. This motherboard features an integrated Intel Celeron 847 1.1GHz dual-core processor, two DIMM slots for up to 16GB of DDR3 RAM, one PCI slot, four SATA ports, Gigabit Ethernet, and more. Rebate expires May 31.

Update: Note that this item is temporarily out of stock at Amazon, but can still be ordered at this price for delivery when available.

Dealfisher offers the factory-refurbished Coby Kyros 9.7" 8GB Internet Tablet with Google Android, model no. MID9742-8, for $99.99 with free shipping. (Amazon charges the same price.) That's $25 below our mention from last fall and $10 under the lowest total price we could find for a refurb elsewhere. This 1.1-lb. tablet includes a 9.7" 1024x768 touchscreen LCD, Cortex A8 1GHz processor, 8GB storage memory, 1GB RAM, 802.11n wireless, microSD card slot, front-facing 3-megapixel webcam, 720p video recording, mini HDMI output, USB connectivity, and Android 4.0 OS (Ice Cream Sandwich). A 90-day Coby warranty applies.

Amazon offers the New Balance Men's Cross-Training Shoes in Grey/Lime for $53.28 with free shipping. That's the lowest total price we could find in any color by $3. They're available in standard and wide widths in most sizes 10 to 15.

Other World Computing offers the OWC Data Doubler Optical to SATA Drive Converter Bracket for MacBook and MacBook Pro (pictured), model no. DDAMBS0GB, for $44.99 with free shipping. (Newer Galaxy Distribution Company via Amazon charges the same.) That's the lowest total price we could find by $22. This bracket allows you to add up to 1TB of internal storage to your MacBook or MacBook Pro in place of the optical drive. It comes with a 5-piece toolkit, screws, and an installation guide.

Also available from Other World Computing is the OWC Data Doubler SSD/2.5" Hard Drive installation Kit for Mac mini, model no. DIYIMM11D2, for $34.99 with free shipping. (Newer Galaxy Distribution Company via Amazon charges the same.) That's $10 off and the lowest total price we could find. This kit allows you to add a 9.5mm or smaller 2.5" SATA Hard Drive or Solid State Drive (not included) to your 2011, 2012, or later Mac mini. It also comes with a toolikt and installation guide.

Home Depot offers the Toro 12-Amp Electric Blower / Vacuum, model no. 51609, for $64.88 with free shipping. (Amazon charges the same.) That's an overnight drop of $10 and the lowest total price we could find by $13. It weighs 7.5-lbs and features an air speed of up to 235 mph, variable speed control, metal impeller for shredding leaves, and more.

When they debuted for consumers earlier this year, 4K TVs carried a $20,000 price tag. For this reason, we'd wager that few dealnews readers realistically ever considered buying one — that is, until Seiki released a 50" 4K TV for just $1,500. Despite that crazy low price, there are still many reasons why it's not worth investing in 4K technology just yet.

eXpansys offers the AMZER Flipcase for Samsung Galaxy S4 in Black (pictured), model no. AMZ95751, or White, model no. AMZ95752, for $8.90 with free shipping. That's tied with last week's mention and $11 under the lowest total price we could find for a comparable flip case. It replaces your device battery cover for extra protection against smudges, scratches, and dirt.

A close price: FommyFommy via Amazon has it in Black or White for $8.95 with free shipping.