Hello Sir, We've done a similar website for an australian company before. Unfortunately the website is not live right now. It had the same features, where business can register, put their products and user can buy them. It was very very similar to ebay, the url was: http://onlinesupermarket.com.au.
I am very much interested and am certified on the said technologies. I would be glad if we could discuss. Thanks again, your response will be highly awaited.