Double glazing for moon and Mars colonies
Vacuum cleaner sales - the moon is very dusty
Garden centre selling plastic plants, bushes and even plastic trees (and some artificial grass to walk the dog on)
Some wind turbines to remind you of the countryside on earth.
Mac Donald's franchise, with a good supply of coca-cola, so people can decorate the surface of the moon with the empty cans.
Face mask supplier
Insurance salesman for radiation sickness cover
Dilithium crystals supplier for passing starships
Trampoline sales for personal moon orbit trips
Extra-heavy footballs (so they don't go into orbit when kicked hard).
A video to remind you of how wonderful life was during the lockdown (compared to your tin can apartment on the moon)