Startup Idea : Daily Deals for products/service people want

A daily deals website that users can post products that they are looking to buy. If that product receives enough likes/votes we source the lowest price possible in 1-2 days in order to revieve a group discount. eg. TVs, household applicances, clothes, cars, etc. Once the price has been finalised with the vendor, we put it live for 1 day with the product only selling if it reaches a certain amount bought. It can also work on a sliding scale where after each purchase the price will decrease and at the end whatever the final price is what the user pays for. The site will also promote which store the roduct has been sourced from, not just the brand.