Woot offers JBL Jr. Pop - Waterproof Portable Mini Bluetooth Speaker for $14.99 (orig. $39.95) + free shipping with Prime.

Product Description:

Party like a Popstar with the JBL Jr. Pop Waterproof Portable Mini Bluetooth Speaker. Whether on the hiking trail, at the beach, or around the camp fire, you don’t need to worry because it because it's built with durable materials and is fully IPX7 waterproof. It's packed with a rechargeable battery to enjoy up to 5 hours of playtime. You can even add in some disco lighting around the camp fire with the fun built-in light mode. It's ultra-portable small size (slightly larger than a hockey puck) and built in strap make it perfect for any trip or activity. Plus, JBL Jr. Pop delivers great JBL signature sound.
Wireless Bluetooth Streaming
Wirelessly stream high-quality sound from your smartphone or tablet.
5 hours of playtime 
The built-in rechargeable battery supports up to 5 hours of playtime.
IPX7 waterproof 
Take the JBL JR POP to the beach or the pool without worrying about spills or even submersion in water.
Built-in multicolor light themes 
Designed to add more fun and interaction with the built-in multicolor light mode.
Ultra-portable with strap 
Compact design to make music highly portable, kids can use the strap to attach the speaker on their backpack.

• JBL Sound Quality
• Wireless Bluetooth Streaming
• IPX7 waterproof
• Built-in multicolor light themes
• Power Source Type: Rechargable Built-in Battery