you can find one version on ellusionist.com. there are also a couple other versions, like the one david blaine did in one of his tv specials (which i don't know if there is anything published on that version).
i don't really think anything i've seen is worth actually buying. the method is exactly what you might think it is, and not anything groundbreaking. not to knock the actual effect, when done right it can be awsome; but i think it has more to do with working on your slight of hand ability, than anything the tutorials can help you with.