Aukey Direct via Amazon offers Prime members the Aukey Bluetooth 4.1 Receiver, model no. BR-C9, for $6.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's $10 off and the lowest total price we could find. It can pair up to two devices simultaneously and features Bluetooth 4.1, and a range of up to 33 feet.