Every so often, I go to the Nation's Gun Show at the Dulles Expo Center in Chantilly, Virginia. This is about 25 miles west of Washington, D.C., and a stone's throw from Dulles International Airport. It's an enormous show, too big to cover in one day if you like to browse and take your time. (They do sell multi-day tickets.)
I was there a couple of weeks ago, and was pleasantly surprised at the variety and selection available, everything from the usual modern polymer-framed pistols to antique rifles and shotguns.
Years ago, I bought some good guns at that show, including a 1st shipment 1926 .44 Special Wolf & Klar.