I used to get it through Tiernan Industries. They made the Son of a Brisket smoker. Sadly, they ended their grill making production and they were the only ones around to distribute Jerrys seasonings.
I find Texas Thunder rub to be very similar to Texas Brothers Bbq rub. Both are not salty or hot, a tad on the sweet side. Very similar to Savor Spices Fine Swine and Bovine.