I found these Columbia and ExOfficio snap button shirts at Benchmark Outfitters, an outdoor clothing retail store, in Cincinnati.

I found these snap button shirts at a couple of thrift stores while traveling through a few small towns in Ohio. Ditch Plains Prana Hollister Pardner Wrangler American Eagle Outfitters J. Ferrar RK Brand Thor MX GPH Supply Company Helix Chalc

I found these snap button shirt brands at a thrift store. Urban Pipeline American Eagle Outfitters Roebuck & Co. Aeropostale  

I found these western style snap button shirt brands at a local thrift store. Wrangler Hollister American Hero DKNY Mossimo