BigDeals (99.1% Positive feedback) via eBay offers the manufacturer refurbished Logitech UE Ultimate Ears MINI BOOM Universal Bluetooth Speaker for $36.99 shipped. That's $63 off the original list price, $27 less than Amazon for a new one and the lowest we can find in refurbished condition. You can save even more by buying pre-owned at GoldstarTech (99.6% Positive feedback) via eBay for only $29.99 shipped.
You may want to double-up and connect two UE Booms together with the mobile app to create true stereo sound. Rated 4.3/5 stars from over 1,000 Amazon shoppers and regarded highly in our own speaker review.
Note: The UE MINI BOOM is now part of the previous generation in the UE lineup. The UE ROLL is now the newest speaker in the series. You can find them at Amazon starting around $90. 
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