Fry's offers a single Polk Audio RTI 12 Floor-Standing Speaker in Black for $299.99 with free shipping. (Price shown in-cart.) That's the lowest total price we could find by $349. This speaker features three 7" woofers, two 5-1/4" midranges, and one 1" silk dome tweeter; it handles 50 to 500 watts of power.
Note: If you're looking for a pair (or more), you'll need to place individual orders or choose in-store pickup.
For in-store pickup only and with stock varying by ZIP code, Fry's Eletronics offers the Polk Audio 50-watt 10" Powered Subwoofer in Black, model no. PSW10, for $69. That's tied with yesterday's expired mention and the lowest total price we could find by $51. It features a medium-density fiberboard enclosure, frequency response of 35Hz to 200kHz, and line-level and speaker-level inputs.