I dunno - a whole dollar (US!) - seems like a lot for a used O-ring that's only going to last a minute...ckharlan66 once bubbled...
I will start the bidding for the pleasure to hook someone up with O-ring at a dollar.

Especially as the overriding theme for dive gear purchases seems to be to get high quality gear that will last...

Darn, Spectre beat me to my idea of O-ring and jep... typing too slow today