This is a toy that I remember from the late 1970’s, but Wikipedia informs me that Wham-o first began selling them in 1961.
They’re … still around, surprisingly enough. You can order them online.
Or you could just make your own. A good friend of mine is a particularly intrepid Virginian who constructs one that stretches the length of interstate in her backyard every Labor Day weekend. But she and her husband feed it with well water, though, and it is ICE cold. Southerners are a hardy lot.