Secondipity via eBay offers the refurbished Marshall Kilburn Wireless Bluetooth Stereo Speaker, model no. 4091189, for $159 with free shipping. That's $115 under the lowest total price we could find for a new unit. It features a 3.5mm auxiliary jack, two 3/4" tweeters, a 4" woofer, and up to 20 hours of playback time per charge.
No warranty information is supplied.