Ebay offers ECOXGEAR GDI-EX3W210 Floating Bluetooth Speaker for $32 (reg. $69.88) free shipping.

Product Description:
100% WATERPROOF AND DUSTPROOF - meets IP67 international standards,no worries with rain, sand, or snow; Drop it in your pool, lake, orocean - no worries, it floats

• DRY STORAGE - a large,spacious, watertight dry storage for your phone, keys, and more;External music and phone buttons enable full control while your devicesare safely stored inside
• BATTERY LASTS FOR HOURS - up to 15hours of playtime at average listening levels, 5 hours at max volume;Battery fully re-charges in approximately 3 hours; Speaker plays whilethe speaker is recharging
• BLUETOOTH V5.0 - streams audiowirelessly from your device while inside or use it as a standalonespeaker and stream audio from a Bluetooth enabled device up to 100 feetaway