Patozon via Amazon offers the Mpow Bluetooth Receiver in Black, model no. 3032, for $17.99. Coupon code N8KGYZCY cuts the price to $12.99. Plus, Prime members receive free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $6.10.) That's $7 off list and the lowest total price we could find. It can link two Bluetooth devices within 30 feet and features a 10-hour talk time.

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