The regular orange habanero is about the hottest you can find around here. And even that is not available at some stores (*ahem* Wal-Mart, I'm pointing at you...). What's ironic is that, while Wal-Mart apparently believes that their customers are too pathetic to handle a habanero and therefore sell no fresh fruit, they apparently have no problem selling live habanero plants at the beginning of the growing season (Bonnie Plants brand). Hypocrisy?
Typically, the ones you're almost guaranteed to find are bell, banana, anaheim, poblano, and jalapenos. And often in bad, shriveled condition (especially the habs if there are any). And as if finding decent, fresh peppers around here wasn't bad enough, the jalapenos from the local Giant Eagle suck ass; they have very little noticeable heat (even the ones from Wal-Mart are hotter).