You need to ask the manager at the store. Here in our city none of the supermarkets allow tipping.
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Note to L,
A few of the supermarkets will not allow us to push the carts ourselves. Too many are left in the way of drivers and parking places. They have bag boys who take the carts to the cars, unpack them, and then take the cart back into the stores. It also keeps them from being stolen if left outside too long.
