OSCommerce/Data Harvest(repost)

I am a firearms/accessory/optics dealer, and I use two primary distributors.? Both of these distributors have sql type databases online that I see when I log into their site.? These databases contain their current inventory, including what is in stock and what is out of stock, photos, descriptions, etc.? I don't view or have access to the databases directly, but see the results of queries run on the database in an excel looking grid format on a webpage when I search for items.? I had someone create for me a dataharvesting project that harvests the data from both distributors' websites, creates a single database containing everything available from both distributors,? and all information and photos, ect, and then uploads? a filtered list to an online auction site for firearms.? This project is still in progress and not complete.? I need someone to be able to do this same thing for my oscommerce store that I already have set up.? It is the latest version, and is basically unmodified aside from adding my own logo and site name.? I need the store populated with the combined inventories of my distributors, and to be able to update the quantity in stock on a frequent basis, with price updates and searches for new products less frequently.