Clone http://www.antonline.com. What they did is to combining 6 suppliers' datafeeds and map their products into appropoite categories at least once a day automatically. There may be overlapped products among the suppliers but the website will only show the cheapest one.
Also there may be different names for the same product among the suppliers, the program should be able to recogonize that.
When a customer buy a product, the website will fetch the real time quantity for that product again to make sure no back order.
Please browse [url removed, login to view] in detail, especially their category structure and backend running principles before you [url removed, login to view] provide us your portofolio when you bid.