I am currently is the process of developing the framework and coding for my program that take the b*tch work out of finding what products from one site are profitable to sell on another.
(my program is focused towards books and the use of isbn vs UPC)
Here is a VERY simplified summary of what tasks my program is intended to do. My program tests a massive list of well ranked isbns(obtained from third party) and loops through a compiled list of classifieds sites, if there is a large enough potential profit margin, it lists the item on the site it would sell at the highest price for. The program will run this loop multiple times per day. The second function of this program will be to check current listing created and make sure that the item is still the lowest price on the current site and that it can still be purchased from the site, its intended to be bought and dropped from. Might sound pretty simple but there are far more complex conditions and scenarios that I don?t want to take the time to explain.
After all business is just buying at one price and selling at another.