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

Thor MX

RK Brand

Helix

J.Ferrar

Wrangler

J.Ferrar

Hollister

American Eagle Outfitter

Chalc

GPH Supply Company USA

Prana

Pardners

J.Ferrar

Ditch Plain