I think they have a temporary shopping "day" membership you can get, but you have to pay 5% over what is posted for members.. I think BJ's is the same, don't know about Costco..
Maybe you could try to find someone who belongs. As long as they pay for it, you can go in with them, pick it out, hand them the money, and let them pay. The only thing is if you wanted to put it on your Discover or Debit card, you couldn't. Then you could save the 5%. Once you go in and look, you may want to even join, there is so much there, you can make up the $35 membership easily.
I think that guests using guest passes still have to pay 5% more than the posted price. If you know someone who is a member, ask them if you can drive them over there and help you purchase this. This is not against Sam's policy, I have done it many times with my mom, and the cashier instructed us on how we had to do it.
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