I remember loading up three shopping carts of wine for my wedding at Las Vegas. Also a HUGE liquor store.
I dragged them all up front and said "Are you going to give me a discount?" (If they said no, I would have just left all the carts at the register and walked out.) They kindly obliged and I drove back to Utah with my trunk practically scrapping the ground.
Found out later that I committed a felony, since it was against the law to bring booze into the state without checking it in first, especially that much.