Microcenter is probably the most consistent place. Not a huge selection, but some of the maintstream ones, to get a feel for switches on Keychron and some of the other big brands. Depending on where exactly you are, it's likely +/- 30min of an hour drive, which is only sorta "far" in US terms.

Frys predated the "mainstream" mechanical keyboard boom. If they were still around I'm sure they'd have even more (they were always larger stores).

Old Fry’s had a lot of keyboards.

The Fry’s that shut down was a shell of its former shelf.

If you’re in LA, Microcenter has mechanical keyboards.

They also have a whole rotating robotic wall of 3D filament that works like a physical jukebox.