Gooloo via Amazon offers its Gooloo Bluetooth 4.1 Transmitter and Receiver for $39.99. Coupon code "D7H68KBM" cuts it to $19.99. With free shipping, that's $9 under our March mention, $80 off list, 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 Bluetooth 4.1 with up to a 30 foot operating range, a 3.5mm auxiliary port, digital optical audio ports, and rechargeable battery with up to 15 hours of run-time per charge.