Harman Kardon offers its Harman Kardon Onyx Wireless Bluetooth Portable Speaker with Apple AirPlay for $149.99 with free shipping. That's the lowest price we could find by $230. It features a 55Hz to 20kHz frequency response, two 3" woofers, two .75" tweeters, Bluetooth 3.0 with Apple AirPlay support, USB, 3.5mm audio jack, stainless steel handle, cloth grill, and leather-finish exterior, and up to five hours of wireless playback time on a full charge (eight hours when wired).

Update: Specs corrected.