Any prepaid master cards?

[Asailorshort]

My only mastercard is a starter card with no rewards. Since groceries are one of our biggest expenses, i usually put them on one of my rewards cards so that i can earn something. However, until the govt opens back up & i can use the commissary again, i will be doing our grocery shopping at sam's club - which only accepts Mastercard. Shopping at a store in town is out of the question, as it is prohibitively expensive (i.e. $8 for a gallon of milk expensive). Are there any prepaid master cards that I can purchase with one of my rewards visas so i can still earn something off this expense?

[Creditaddict]

Why prepaid... Scores look good enough to get a real card like sams discover!

[parakleet]

Buy a gift card that can be used as a MasterCard. They're sold in many places - grocery stores, gas stations, or drugstores.

[Asailorshort]

I'd rather not get new credit at this time. I'm waiting for existing accts to age & inqs to fall off. I'm hoping to go on a significant app spree in about 12-18 months to get free miles before we take off on a round the world trip. Plus, hopefully the govt wont be shutdown long enough for shopping at Sams to be a regular thing.