I have a basic installation of OsCommerce. I would like to have it modified so that a custumer can build a wishlist based on the amount they have to spend. If an item has been placed on the wishlist the amount they have left has to be displayed, if they remove an item of their list the amount has to be re-added to their spending limit. They must be able to print and email this wishlist or to log in later (at the physical shop) to retreive this wishlist.
To be clear, I don't need a shipping, tax or checkout at all.