AmiBay.com is the goto place to buy and sell Amiga hardware. Since you have to put a pricetag on the items you sell there (and bide by first come first served) I suggest searching similar items to get a picture of what things go for.
Else there's always Ebay but prices there fluctuate more.
Thanks alot man! some of us might of wanted to buy some stuff without having to deal with amibays silly rules. :angryfire: