I found the single serve cups at one Walmart a couple months ago. Unfortunately, they never got any more. Once they were gone, they never came back.
@Gsg This is why we joke about taking a road trip to Texas. We are making a list of all the items that are free on Ibotta that we can't find and figure we'll find them in Texas (hypothetically of course - post Covid). You are more than welcome to joint us in our adventure.