one problem i can see with this idea, should the product that the add-on was made for be located at a different site is that we would be directing customers to cometitive merchant sites (in competition with renderosity for sales) which we are not supposed to do as merchants HERE. if the product is located at renderosity, it would be more do-able. From as far as I can tell from the rules for renderosity merchants, we can MENTION the location of products if they are located at another site, but cannot LINK directly to them. Sorry if this is not of much help.