I'm a big fan of Steelsound, IMO the best gaming headsets I've ever used... and two of their sets are on sale at Woot!

The Icemat Siberia in-ear headset: 2 for $19.00 + $5.00 shipping (MSRP $40 ea)
http://www.woot.com/

The Steelseries 4H headset: $19.99 + $5.00 shipping (MSRP $70)
http://sellout.woot.com/

Siberia product page
Steelsound 4H product info page

Like all Woot! stuff, the offer is good today only- expiring at midnight tonight CST (or when the item sells out) And the shipping is $5.00 whether you buy one or three.