There is a "shop" in our area that operates out of one of the owners' garage on a day-to-day basis but they rent a vendor space at quilt all shows within driving distance. At their booth they mostly have pre-cuts and notions....all easily transportable and appealingly displayed.
Another one that has an old trolley car. They take their mobile store to quilt shows.....don't know if their vendor fee is the same or not but they just park outside the entrance to the show. Too claustrophobic inside for me with bolts piled to the ceiling and all that lint and sizing in a small space plays havoc with my hay fever. But they are a retired couple and it works for them.
Good luck with whatever you decide!