The Lansing aka Mason gun show is a very nice show, parking is tight so get there early, and one caveat although it is a Friday - Sunday show... Friday is dealer optional, and if you go then expect to see many empty tables...
Held at the county fair ground just east (about 1 mile) of the Mason city square on the south side of the road...
Prices are so so, with some of the more plentiful guns you can get a decent price on them due to competition, but the hard to find items may bring a premimum....
Parking lot sales are not allowed.... however you can take a gun inside with a sign to sell....
BOT no loaded guns are allowed in the show OC or CC, they will ask you at the door, make you unload and they will bag and tag your ammo for when you leave and put a yellow zip tie in the action of your gun....