I stumbled across Cedar City Neon Sign Company while looking at Cedar City, Utah and its diverging diamond interchange as seen in this Road Guy Rob video. It's not much...it's at 563 North Airport Road and looks to have been located here for years. It's got a "sign graveyard" in the back (clearly visible from Google Street View with the older Chevron and Shell signs I like. (Sparkle Sign Company in Houston used to offer a similar sort of thing but it looks like a change in ownership "cleaned up" the lot). I'm not sure if they offer tours but it looks fun.
