We first bought Slap Ya Mama at Bucky's, the gas station/every thing highway place in Texas. (You have heard Bucky's slogan Eat Here and Get Gas”. Not sure if Mr D still uses it anymore.
Will check out Joe's Stuff for him.
Yeah, I stop at the new Bucky's at the Hwy. 80 / I-20 junction on my trips back to Louisiana. I didn't see where they were using that old joke - the truck stop diner / gas reference goes back forever. I remember seeing a wall poster at some store with that "sign" back in the '70s (Spencer's Gifts, perhaps).
FWIW, there's not much difference between the regular Joe's and the hot version. Teeny bit more cayenne, I think. Try the original (which was sold for around twenty years before the hot version was added).