Got an email today with some new AMEX offers, thought this one might be useful to purchase some DGCs... This was on my Marriott Bonvoy AMEX.
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Would be good if you could combine it with another DGC discount, such as BJ's (I don't think Sam's Club takes Apple Pay?), but you'd probably have to buy a $75 DGC which then reduces the overall discount.
For example, if you bought a $25 and $50 DGC at BJ's to hit the $50 threshold, your overall discount would be around 9% off. ($72.98 before discount - $5 or $67.98 for $75 worth of DGCs which is only about 9.36% off.