TopBrandBoxUS via Amazon offers the Trendwoo Waterproof Bluetooth Speaker for $28.99. Coupon code "POCKET88" drops it to $17. Plus, Prime members bag free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $5.40.) That's $11 off list and the lowest total price we could find. It features two 3-watt speakers, hands-free calling, and a compact design.