This Soundstream H2GO Bluetooth Speaker is $19.99 with free shipping from Microsoft via eBay. It streams audio wirelessly and has an IPX7 waterproof rating that allows it to survive being submerged in up to 3ft of water. Also, with up to 25 hours of playback and a built-in power bank, it keeps your phone or tablet charged.
https://www.ebay.com/itm/28347580…noap