It is; and you can find it in at any Borders manga section! I have quibbles with the translations but they're decent overall. Um. I have to warn you that it is a kid's manga (though Japan has more respect for what kids can handle). I also must warn that Kaiba isn't a major char until the second half; he starts out as one of many villains, and a pretty obnoxious and two-dimensional one, too. (Actually I hated the char until his third appearance, when he got a personality makeover...) Also also I have to warn that Kaiba's backstory is given in about 4 pages total and thus much of what I & others write about his past is extrapolated from little hints.

Ah, enough warnings - my original sort-of-pimping post can give an idea of what you'd be in for. It's not for everyone, but I'm not the only one who got more obsessed than I really ought to be (and it's mostly Kaiba's fault...)