Erik, I've tried to buy Coopers locally in the past (for my truck). Local dealers, when you can find them, want as much for Coopers as other, premium, brands. Not that I'm stuck on brand names, but before I take a risk with something like a tire, I want either a great price or a great reputation.
Using my truck as an example, I was able to find a set of Yokohama Geolander AT tires for less than the Cooper AT tires (4 tires mounted and balanced for $550ish). If nothing else, the Yokos have an actual reputation offroad AND stores that carry them in stock in the event I need an early replacement.
Chris