Sennheiser RS120 RF-Wireless for $60

If you are looking for an RS-wireless (non-Kleer) headphone system, the new condition Sennheiser RS120 is on sale for $60 with free shipping at Groupon and Amazon actual (limit 5).

This is comprised of two parts, the transmitter-base and the headset. You can purchase additional headsets and connect them to the same base. The headsets only work with the transmitter you cannot use them via 3.5mm.