I would rather do the merch gigs in those stores. Merches are the best. You are permitted to be there and never check the restroom, or purchase anything, or run the risk of getting kicked out of a location.
I will only ever do price checks if it's in a big multipurpose retailer like Walmart or a supermarket chain that has really big floor space like say, Stop & Shop here on Long Island. You can lose yourself in the crowd, so to speak.
But so many MSCs offer these in little cubbyhole convenience stores with the promise that "It only should take 20 minutes!" huh? Try spending 20 minutes taking photos in a 7-Eleven on Long Island. Your chances of not being confronted are basically 0%.
Another case of Mayberry-based MSC's not understanding that all markets aren't the same.