Interdimensional profiteering

You ever drive by those shops in the middle of now where ya know the ones, small square structures which may or may not have boarded up windows?

Maybe it’s just a warehouse, maybe it’s some condemned property that would cost more to get rid of than simply let rot, but then you see someone enter the building and use it as a store. So, with that theory not working you begin to come up with other ideas such as how it may be a front for some sort of money laundering operation or maybe just maybe it has enough of a clientele that keeps the store afloat.

OR maybe it’s a store that has a magical portal on one end connecting it to a fantasy universe full of elves, gnomes, goblins and other such fantasy races and is making a bunch of money by simply selling modern goods to their medieval world.

What, don’t believe me well tough shit sugar tits cause I’m stuck with such a shop, so if you know how to set up a logistics network for such a store, deal with the large amount of politicking that comes with being able to supply fruit in the dead of winter all the while explaining my income to pay my taxes without being thrown into a loony bin then that would be great? Because the cops are starting to believe I´m in bed with some cartels and I don’t know what to do anymore.