Sunvalley Brands via Amazon offers the Vava 24-Hour Waterproof Wireless Bluetooth Speaker in Black for $31.99. Coupon code "3BHRE4HQ" cuts it to $21.99. With free shipping, that's $6 under our January mention and the lowest price we could find by about $17. It features an IPX5 waterproof rating, up to 24 hours of playback, and a 5,200mAh rechargeable battery. Deal ends April 24.