Thanks for the note. Doing a quick look at the product details on Amazon shows that the ISBN number is not the same. However, does that necessarily mean it's not the real thing? I mean, when books get updated and published as new editions, the ISBN changes, right? Might this be an updated version of the book others already have? I think I have seen the book listed on MixedMartialArts.com before and IIRC the author is the same as the one on the Amazon.com listed book. The MMA site is down right now though, so I can't check it for details about the book. If it's the same author(s) and/or publisher, but the ISBN doesn't match, I'd be inclined to think that Amazon has an updated (or possibly older) version of it available. I'll try to check again later and see what I can find.