Sunvalley Brands via Amazon offers the Vava 24-Hour Waterproof Rugged Wireless Bluetooth Speaker for $29.99. Coupon code "WXPX9TRR" cuts it to $19.49. With free shipping, that's a buck under our mention from a month ago and the lowest price we've seen. (It's a low now by $19.) It features an IPX6 waterproof rating, up to 24 hours of playback, a 5,200mAh rechargeable battery, and carabiner clip. Deal ends May 23.