Aomais Direct via Amazon offers its Aomais Go Waterproof Bluetooth Speaker in several colors (Black pictured) for $69.99. Coupon code "02065499" drops it to $54.99. That's $15 off list and the lowest price we could find. It features Bluetooth 4.2, IPX7 water resistance rating, up to 30 hours of playback, and a 7,200mAh rechargeable battery.