Monster Shock 30W IPX6 Waterproof Portable Bluetooth Speaker $27 at Amazon $27 $50 New price low. Amazon with Direct-sale has the Monster Shock 30W IPX6 Waterproof Portable Bluetooth Speaker for $26 with free shipping on $35+ or with Prime. Has an advanced Bluetooth 5.4 and up to 17 hours of battery life. $27 retail: $50 Posted by DrBatman03/31/2026 at 09:32 PM PT