All4Cellular via eBay offers the refurbished Sony Wireless Noise-Reduction Headphones in Black, model no. MDR-RF925RK, for $34.95 with free shipping. That's the lowest total price we could find for a refurb by $15. These headphones work up to 150 feet away from the base and feature a 20Hz to 20kHz frequency response. A 90-day Sony warranty applies.