Startup Idea : I dictate

We have many e-commerce websites , where a user has to go and buy things. There are some websites to compare prices. My idea is to have a e-commerce website where in a user selects items and asks vendors to quote. Once the user approves a quote , the details would flow to vendor's portal as requirements and my portal would earn commission from vendor. It would work like a peer to peer or broadcast tender. This would help local grocery store to become competitive if the user's location is near to his shop. It will make an end user to get good bargain from many places . ...I am ready to team up with minimum finance and other logistics support .