Tanga offers the refurbished Sennheiser RS120 On-Ear Wireless RF Headphones with Charging Dock for $49.99 with free shipping. That's $20 under the lowest total price we could find for a new one, although we saw a refurb for $2 less last month. Features include a frequency response of 22Hz to 20kHz, three selectable channels, and wall-mountable transmitter.

A 30-day warranty is included, but it's unclear who backs it.