They have one day passes periodically, but anything you buy is 10% higher than the posted price for members. The exception to that is alcohol - regulations require that anyone can buy alcohol without a membership at the price posted.
No card is necessary to walk throughout the store but you need to have a membership card to purchase items.
I have never known them to offer a pass. However, I'm pretty sure they will let you in to walk around and compare prices.
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