How much is a one day pass

You need membership buy not to get inside the stores

They have a "preview" pass for a day. But in order to purchase anything, you need a membership. The basic membership is around $40 but if you shop there a lot like I do, they have a membership that is $100. You do save A LOT on prescriptions and also get rewarded at the end of your membership year with cash back incentives on the more expensive membership. They do have the best deal on paper towel anywhere, by the way.

Free plus upcharge for be purchases.

I am not aware of any membership less than a year. You can print off a pass to get in and preview the store through their website, but if you buy something with that pass they will add 10% to your bill.