Polk Audio via eBay offers its factory-refurbished Polk Audio Omni S2 Wireless Speaker for $69.99. Apply coupon code "PSUMMER20" and checkout via PayPal to cut that to $55.99. With free shipping, that's the lowest price we could find, and $79 less than what you would pay for a new unit. This compact speaker features a swappable white faceplate, two 2" full-range drivers, 2-channel amplifier, and built-in dual-band WiFi.

Note: Coupon can be used once per PayPal account within a single transaction. A 2-year limited Polk Audio warranty applies.