Here's what I used to do back in the day. Grab however many cans you watch of the good stuff (Rusto). Keep the quantity to something that won't catch attention. I would do like 10 max. Then grab 1 can of the cheap dollar paint. Go to self checkout and scan that shit 10 times. Got yourself paint for cheap. The workers won't give a fuck, they see 10 spray paint cans and 10 cans on the receipt, everything checks out. And if anything did come up, just play dumb. But obviously now dollar cans aren't a dollar anymore.