B&H Photo Video offers the Bose SoundLink Bluetooth Speaker III, model no. 369946-1300, for $269 with free shipping. (Microsoft Store charges the same.) That's the lowest price we could find by $30. It features a 30-foot transmission range, four drivers, two passive radiators, 3.5mm and microUSB inputs, and 14-hour battery life. Up to six Bluetooth devices can be paired with this speaker.