Registry for companies/individuals to request items available on this web site

[LWAA]

I am setting up a photo print store for a local charity using coppermine. I need a way for a registered user to add existing images to a kind of registry so that other visitors (registered or not) can look at the registry and buy one or two images from it. These images would then be removed from the registry, or have "bought" or something inserted over the thumbnail.

I need to put a proposal together for my client and need an idea as to what setting something up like this would cost. If you could do it, please reply with a ballpark figure and we'll take it from there.

Thanks.

(I have coppermine set up and working on the client's server)