There is no limit on samples. I repeat, there is no limit on samples.
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In most states, you don't actually have to be a member to buy booze.
If the liquor store is a separate entrance, you can walk right in. If it's inside the store, just go to the customer service desk and ask for a “Temporary Alcohol Shopping Pass” which will let you buy (only) booze.
Kirkland is the store's name brand, which is usually the best deal.
These products are a a kind of “private label” and often made in the same factories as higher brands. It's rumored that Jim Beam makes the bourbon and Grey Goose makes the vodka