If you are unsure of the worth on some particular 
cels, you could put them up for offers.  People 
hate making offers, but if you have a cel(s) that 
is highly sought after or rare, it could be worth 
a lot more than you know.  This way you can be 
sure to get what the cel's really worth..to 
someone anyways ^_^.  I also like just a plain 
page with cels for sale with a price. You can 
list the page here, and the ones that do not sell 
after a couple weeks can go to Ebay.