Used Sennheiser HDR-40 Wireless Headset with T-40 Charging Base for $28 shipped (Missing Proprietary Cable)

If of all the Sennheiser wireless headphones through time and space it is the HDR-40 Wireless Headset with T-40 Charging Base the one you want, you can get it in “Used – Excellent Minus” condition for $21 plus shipping (around $7 it seems) at Adorama directly or by Adorama on eBay where they have “Best Offer” enabled, so you may be able to get it for less. The shipping fees vary slightly between their website and eBay because of different shipping algorithms.

IMPORTANT: these listings are MISSING its proprietary 3.5mm audio cable, so don’t buy unless you already have a compatible cable or you know where to find it.