I've been able to buy Grande at the Hillsborough Vinny's, but not every time I've asked. My guess is that whether or not the manager sells it to you depends on how much they have on hand at the moment and when their next delivery is. Obviously, they don't want to run out before their next delivery! Also, my experience suggests that the staff are only allowed to sell what's on display: for cheese, toppings, flour, etc., you have to get it from the manager.