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I agree with JC, I think you are better off making you own for several reasons:
It will be cheaper in the long run. Commercial rubs and sauces are expensive.
Make what YOU like. A simple search yields dozens of "Memphis Rub" recipes, all a bit different. Besides, what I like in a rub may be too salty, sweet, whatever for you.
Easy to make: You can find loads of recipes on the web to start with, then tailor one or more of them to meet your needs and likes. Most rubs can be made with basic spices and seasonings you probably already have in your kitchen.
It's fun and easy. Plus when you get something you like you can tell everyone it's a secret.
I live in Memphis, so there are a plethora of local rubs available here, but I'm not sure how far they get distributed. The biggest names & the most likely to get widely distributed are Rendezvous & Corky's. I'm a big fan of Central's Hot Rub, which I use for wings, & their Rib rub. If you can find that, you're golden.
The rib rub is a great base if you want to tweak it for personal tastes. I found that adding a bit of Rosemary for ribs or pork butts really adds a great flavor profile. I mixed up a batch of the Texas rub and tried on a brisket and it was good, but I still prefer just salt and pepper.