Ebay style Auction script to setup on our server

Hello I would like to setup an ebay auction script on our Windows server with php installed. I want to offer products for auction only i.e 1 way only. This is called a merchant auction. I am pretty sure most scripts allow this. I would like you to suggest the best auction script, this could be paid or open source. You will be bidding for your services only, if the script is paid for I will pay for that separately