You should try making some rub of your own. You can go to the dollar store and get some spices to experment with. This will also help you in acquiring some flavor profiles. I use all my own rubs to smoke with. I created a base reciepe and depending on what I'm doing that day, I will add accordingly. Here is a good base to start with. Equal parts of Chili powder, granulated garlic, onion powder,season salt, black pepper. Then depending on your style, you can add like powdered mustard, celery salt, cumin, tumeric, to taste. Biggest thing is don't be afraid to try.