I happened across Amulet in a local bookstore, which is the only place I've seen it.
While fans wait for Amulet #6, they might like to watch out for another YA graphic tale: 'Gunnerkrigg Court' by Tom Siddell. This covers the adventures of two schoolgirls living in a rather peculiar and secretive enclave in a mythago-like wood somewhere in England. A glib description might be 'Hogwart's for girls' but that's a bit like calling 'Amulet' manga.
While I don't think Siddell's artwork is as refined as Kazu's, it is still very good and has improved immensely since the beginning. The storyline is every bit as intricate, with the tone varying from light humour to occasional heavy drama.