Wild West general stores often had a 'Post Office' setup with lots of little shelves for the mail. Also a telegraph setup. Stores like that are often shown with two old guys playing checkers, and a big old hound dog asleep in front of the fire. Lanterns, candles, oil, earthenware jugs, barrals of stuff, salt cod, salt pork, cured hams, bags of stuff (flour, sugar, beans, seed grain). Wanted posters and advertismenet posters. Sewing notions (treadle sewing machines then) - thread, thimbles, needles, scissors. Bolts of calico cloth Try reading the 'Little House on the Prairie' books for more ideas.