Question for you about paying with your rebate, by paying with your rebate are you foregoing the rebate you would have earned on your $60 purchases.
I don't have a Sam's club membership, but I do have a Costco one. Annually Am Ex sends me a check for my cash back earnings from my Am Ex spending. It's a "check" that has to be cashed or spent at Costco. So I go to Costco and get the actual greenbacks, then do whatever shopping I'm there to do and pay with my Am Ex to earn more cash back. Then I take the cash rebate and deposit it at the bank.
Yes, I get that it's nice to not actually have to run my credit card thru the machine, but if I already have the cash in the bank to cover the charges and can earn more cash cash. I'll take the cash and earn even more cash back.
Hope that makes sense. Don't know if it will apply to you too at Sam's Club, but I hope it does. Cause who doesn't just love that cash back feature.