I have seen photopost classifieds in use here:
I like how it seems to work but I need to have a slightly different option. In addition to the integrated paypal to buy the item, can I make an additional option to reserve the items for 25% deposit? This is needed because by me most people will only pick up their item several months later and I want to let customers reserve items, but commit to paying by making a small deposit.
Secondly, is it possible to have a fixed fee for customers who need the item shipped and to let them select a check box for shipping required?