eBay has the Harman Kardon HKTS 15 5.1 Home Theater Speaker System for $150 with free shipping. Retail price: $649. Features 35Hz - 20kHz frequency response (-6dB), 8 ohm nominal impedence, 86dB at 1W,10" woofer, center channel has dual 3" drivers.
eBay has the Bose Acoustimass 5 Series V Stereo Speaker System (Refurb) for $250 with free shipping. Retail price: $400.
eBay has the Toshiba 30-watt Toshiba Bluetooth Speaker System (Black) for $70 with free shipping. Retail price: $130. Features a CD player, digital FM tuner, USB, and remote control.