OK, I have to give some love to OLD NAVY, they are one of the VERY few stores that I can walk into and buy 34x36 pants right off the shelf. We are talking Khakis here, but hey, that is still pretty great when compared to most other stores that I have walked into. Be warned however, not all Old Navy stores I've walked into have 34x36, but your chances are "good" at least.
Also, their prices are right. I don't feel like I am being discriminated against because I am tall.