how about a "pay it forward" section.
where if you have an item that you just want to get rid of, and someone else "needs" that part, they pay for the shipping that's it. if you have a part post it, if you need a part look there first... i know why not just sell it, I'm not saying listing up a girdled head or something like that, but i had a handle-pole for a 550 and i listed it for free just pay for shipping. this way it helps everyone. i realize that there is potential for people to take advantage but you self police it.... just a thought. it works very well on a motorcycle forum that i hang out on..