Polk Audio via eBay offers its factory-refurbished Polk Audio Omni S2R Network Audio Rechargeable Wireless Speaker, model no. ZM6913-A, for $89.99 with free shipping. That's $9 under our mention from last May and $97 under the best price we could find for a new one. Once wirelessly connected to your router, it allows you to stream music from your computer or network. It features a ruggedized ABS shell and a wireless range of up to 100 feet. A 1-year Polk Audio warranty applies.