Accessory Genie via eBay offers the GOgroove IPX4 Water Resistant Bluetooth Speaker, model no. GGBSRGD100BKEW, for $29.99 with free shipping. (2nd Street Electronics via Amazon charges the same.) That's the lowest total price we could find by $8. It features shock absorbing silicone protection, eight hours of play time per charge, an accessory bag, and integrated metal loop.