Walmart offers that here. They started with 10 spaces, they are up to 10 now. And, it being Texas, they've put up a huge sun shade over the spaces. You call the number on the sign when you get there.
Kroger has started a similar service to try to compete, but their spaces are out in the regular parking lot - obviously an improvised arrangement instead of having been carefully designed.
Well, with progress like that, just imagine how many they'll have in a year.