Used Sennheiser RS120 Wireless for $29

The RF wireless open-back Sennheiser RS 120 headphones are available in “Used – Very Good” condition for around $29 by Amazon Warehouse Deals actual, so you get free 2-day shipping if you are a Prime member.

There are two potential deal killers for these headphones according to the reviews, they lose their connection to the transmitter base if there is short silence (so you get annoying noise), and the mechanics of the AC input are not good.