Patozon via Amazon offers the Mpow Streambot Slider Bluetooth Receiver for $10.99. Coupon code "4WK8549F" cuts it to $8.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.) That's $11 off list and the lowest total price we could find. It features a USB slider case and compatibility with Bluetooth enabled devices.