I’ve fallen into the trap of buying rubs when following a recipe, and have a pantry full of them, but then I’ll try to recreate the rub on my own. It’s not too hard and by making it myself, I can control the salt, which is one of the challenges of using commercial rubs when brining. Salt is almost always the first ingredient of commercial rubs. If you brine, either wet or dry, you can end up with too much salt after adding a commercial rub. One of the best rub recipes around is Meathead’s Memphis Dust https://amazingribs.com/tested-recipes/spice-rubs-and-pastes/meatheads-memphis-dust-rub-recipe/
It’s primary use is ribs, but I use it on lots of stuff. It’s a great base to experiment with. I add jalapeño powder to kick the heat up a notch. Takes all of 5 minutes to mix up a batch and price is a fraction of the cost of a commercial rub. And you don’t have garbage like chemical preservatives.