Bid Software

Hi folks. I'm looking for an in-house solution for "circuit bidding". Today, when we get a request for WAN services, transport, transit etc we have folks that email out to a list of contacts and ask them for a price. I've seen some pretty neat systems in the past where vendors can send us their quotes via a web portal or similar - hoping to find something rather simple for our own use. open source would be awesome. Basically, we would notify potential vendors of that A and Z end of the circuit and any particulars such as speed that are required. What are folks using today and your experiences? Thanks, Paul