I shop at Karmaloop a lot, but that's because I'm a rep (it's Plndrs sister site). This site has bigger size pants. I ordered 44x30 for a buddy of mine a few months back. You're more likely to find bigger sizes in NON kazbah items, and if you want a 20 percent discount you can always PM me. XD
Oh and Urban outfitters
I just wanted to comment though on the length issues(I looked, and I didn't see where it had been said). For you shorter guys with bigger waists - try cuffing your pants without the need to hem them. I can't sew for jack shiz, so I can understand frustrations lol. Cuffing to me looks good if you have the right pants. I wear a 32 length pant, so I don't really have issues, but I still cuff my jeans. I like it.