http://www.contour.org/classifieds/classifieds.php?t=1&c=5The classifieds section is reserved for things like this. You can make a note of something you have for sale if it's a special deal, or a group buy, and you can put a little note in your sig, but the listing should be in the classifieds. People will go there if they are looking for parts!
that being said, you might want to throw a note in the local forum for your region when you get the ad up, for locals to see.
Good luck selling them, and watch out for the scammers!