Lukenick, in your original post, you wanted to find inexpensive tires. In my humble opinion, this is one place you do not want to go cheap. You have received some good advice here. Next time you are close to Costco, stop and ak if they will mount tires bought elsewhere. You might even see if they can order you some good (Not cheap) tires.
2015 White Hawk 20MRB
2011 F150 Non EcoBoost (5.0)