If you are looking for something specific that's uncommon, there's really no getting away from using the Internet, unfortunately.
Gunbroker's "no listing fee" policy is really what drives the idiocy on there. You have a lot of sellers just relisting stuff with stupid prices OVER AND OVER without any downside to them. Even a minimal relisting fee would clean that place up really quick.
And with mechanical wonders like guns they're somewhat unique. If I can't touch, feel, taste, smell and dryfire it I'm probably not going to buy a specific gun on the net, that's just me.... go to the auction and examine it myself. Pictures and descriptions all too often leave a lot to be desired. Auctionzip is great... so are live in person auctions IMO.
Garbage like a ugly Russian bolt or 1916 Spanish mauser in 308.... dime a dozen so why not.