If I want a quick price check, what I'll do is go to gunbroker and look for items that are actually being bid on. If it's a common item, like a new CZ pistol, I'll just see how high the actual bids go before you won't find anyone bidding on it. So, somewhere between the hightest actual bid and the lowest priced gun that has gotten no bids is a good indicator of value. The spread is much smaller than you might think.