Autocaredepot via Ebay offers this Autopipe PA Speaker, model no. NTX500G, for $18.21 with free shipping. That's the lowest total price we could find by a buck. It features a brushed brass finish and 125 watts RMS power handling (250 watts max).
Walmart offers the LG Sound 360 Bluetooth Speaker in Black, model no. PBS-C510.ACUSBK, for $89 with free shipping. (Groupon charges the same.) That's the lowest total price we could find by $29. It measures 3.74" x 3.74" x 9.9" and is compatible with iPhone, iPod nano, and iPod touch.
Adorama offers the Mackie 6.5" 65-watt 2-Way Powered Studio Monitor (pictured), model no. MR6mk3, for $149.99 with free shipping. (B&H Photo Video and Musician's Friend charge the same.) That's $10 under our March mention and the lowest total price we've seen. (It's a current best by $50.) Features include 65 watts of Class A/B amplification, 46Hz to 20kHz frequency response, 6.5" polypropylene woofer, and 1" silk-dome tweeter.