I'll pick up one of the strays that's already in the parking lot and take it into the store with me. When I come out I'll put it in the cart return IF there is one nearby. If there isn't I hook the front wheels over a curb so it can't roll and I'll leave it there. Afterall, I GOT it from the parking lot and by curbing it I have made it less of a nuisance/ hazard.