The easiest thing to do is go on gunbroker and look at the closed auctions for a few items you like. You can do that by logging in to gunbroker under your user name (you need an account) and hitting advanced search. Click on the completed auctions tab and search for the gun you are interesed in. It will list a bunch of auctions with the number of bids and what they sold for. You can click on the auction to see if it actually sold. Look at a few and decide what you are willing to pay. Dont forget, with most live auctions there is a buyers premium, so factor that in too.