Gooloo via Amazon offers the Gooloo Bluetooth 4.1 Transmitter and Receiver for $25.99. Coupon code "K9WISL6O" cuts it to $19.75. With free shipping, that's tied with last month's mention, $80 off, and the lowest price we could find. This 2-in-1 unit switches between transmitter and receiver modes to allow non-Bluetooth devices to work with Bluetooth devices including speakers, headsets, and phones. It features a rechargeable battery with up to 15 hours of run-time per charge.