Inateck via Amazon offers its Inateck Mini Bluetooth Streaming Music Adapter, model no. BR1001, for $13.99. Coupon code "856JBZUC" cuts it to $11.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.01.) That's $18 off list and the lowest total price we could find. It features a 3.5mm port and signal range up to 33 feet. It allows any stereo to receive a Bluetooth signal.