OsCommerce Customization

We have an ecommerce website based on oscommerce and we have some issues to fix: - Resellers Prices: reseller prices are calculated with a custom function present in our admin panel. Actually it doesn't work anymore and we need to fix it. Probably are needed just few rows of code. - eBay synchronization (Auction Lister): as eBay Italy changed their category tree, we can't list all items in our eBay store because the ebay scripts try to list the items in the old categories. We just need to "refresh" the category tree in our admin panel so we can list again all products we need. Furthermore we need price rounded on our ebay store. - Product Descriptions Layout: The layout of our products descriptions must be optimized (we need a better look). We actually import the descriptions and the pictures (small pictures) from a Content Data Service Company. A script already downloads automatically the descriptions and the small pictures. As the company sent us a new feed containing bigger images, we need to import the bigger images and give a better look to the descriptions. We need to complete this project in the shortest time at a reasonable price. We think it can be done