I have no idea. I have to special order in the volumes I want to the local bookstores, but then again I have to do the same with the D.Gray-Man manga half the time and the Saint Seiya manga since volume nine or ten and it's stilll translating... The Borders on my college campus keeps a small variety of MA books, mostly the Spiderman ones, actually, but that in itself is some indicator of it doing okay I think. (Well, regardless, I'm doing my part to support MA by buying the Avengers books as I have the money to spare and the time to wait for a special order.)