Gooloo via Amazon offers its Gooloo Bluetooth 4.1 Transmitter and Receiver for $42.99. Coupon code "QOIF7I68" cuts it to $28.80. With free shipping, that's the lowest total price we could find by $35. 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. Deal ends March 24.