Call a local gun shop also and see if they have a copy of the Blue Book of Gun Values. Sometimes the auction sites can be... well, let's just say people can be very proud of what they own. I checked gunsamerica a few months ago to see what people were selling their Swiss K31s for. You can still get one at the gun show for $180 in very good condition, but people were starting auctions for them at $300 - $500 in good to poor condition. A few people were still being in touch with reality, but not many. However, I know the gun shops around here will normally look a gun up for you in the blue book without a charge unless they are crazy busy.