Amazon Warehouse Deals offers the used Sennheiser RS120 On-Ear Wireless RF Headphones with Charging Cradle for $35.90 with free shipping. That's $44 under the lowest total price we could find for a new pair. Features include a frequency response of 22Hz to 20kHz, three selectable channels, and wall-mountable transmitter.

No warranty information is provided. These headphones are currently on backorder with an estimated ship date of February 20.