Sunvalley Brands via Amazon offers the Vava 24-Hour Waterproof Rugged Wireless Bluetooth Speaker for $29.99. Coupon code "EJKKGETC" cuts it to $19.49. With free shipping, that's tied with last month's mention as the lowest price we've seen. (It's the best deal now by $16.) It features an IPX6 waterproof rating, up to 24 hours of playback, a 5,200mAh rechargeable battery, and carabiner clip. Deal ends June 30.