I so rarely use self-rising flour, I'd hardly know what to look for if I wanted some! I just don't ever buy it.
Now, like Pippinwhite, I do buy self-rising cornmeal, but that's because I don't want to deal with measuring the other ingredients since I don't exactly use a cornbread recipe. I just add milk and mix until the consistency is like I want it.
I honestly don't know what I'd use self-rising flour for, anyway. It's just not something I ever use, even for quick baking. For that, I generally use a baking mix or something like that/