DBRoth via Amazon offers the Jumbl Bluetooth Hands-Free Calling and A2DP Audio Streaming Adapter/Receiver in six colors (White pictured), model no. JU-BSR18, for $24.95. Coupon code "R6OS9K42" cuts it to $19.95. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.13.) That's $30 off list and the lowest total price we could find. This receiver allows users to stream audio to devices with a 3.5mm audio jack (such as headphones) and features a noise-canceling microphone, Bluetooth 2.1, and 10 or more hours of playtime on a full charge.

Of note, a Bluetooth 4.0 version, model no. JU-BSR36, is also available for $29.99 before coupon, $24.99 after. The same shipping options from above apply. That's $35 off and the lowest total price we could find.