Sam’s Club is selling Uber gift cards at a 12% discount. These work for Uber Eats to help take some sting out of the delivery fee and markups. Go through a shopping portal for an extra discount. Rakuten’s portal is known to pay out on gift cards too.
Between you and me though, they won’t work for delivery of Taco Bell or McDonalds for some reason, or, I wish there was some reason.