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.
Amazon has the Anker SoundCore Dual-Driver Portable Speaker (Black) for $24 with free shipping on $25+ or with Prime. List price: $30. Compatible with all Bluetooth-enabled devices, connect to your smartphone or tablet from up to 66 feet away, built-in mic for hands-free calls.
Has excellent Amazon Reviews.
eBay has the SONOS PLAY:1 Compact Wireless Speaker (Black or White) for $134 with free shipping. Features two custom-designed drivers with dedicated amplifiers.