However, Kaballah, as a word, has come to mean any mystical work or coded philosophy, in popular, and particularly New Age, literature.
So, at the risk of sounding cynical, it's a word pretty much open to interpretation for any group, and many have been written. There's a Christian Kaballah, a Hermetic Kaballah, a Magikal Kaballah, and of course, an Astrological Kaballah, to name a few.
It also has thousands of versions, as it's been translated, re-constituted, and used in a different way by many different groups, each with their own spin. There is a caveat, though- the oldest version is strictly Jewish and should not even be attempted (say rabbis) until after you are 45 and have studied the Torah in depth for most of your life!
What I usually do is tell someone who is looking for 'The Kaballah,' and doesn't have any further details other than 'It's an old book.' to talk to a rabbi or check out kaballah.com, as they will need a little more spiritual guidance than I am able to give. (And I think we all agree I should not be giving spiritual advice to people)
In short, asking for the Kaballah with no further information than the name is a bit like looking for the 'true' Bible- there is, as far as selling books is concerned, no one real translation/ edition/ whatever that anyone not affiliated with a particular religious point of view could feel comfortable giving out as the 'official' version.
*The Torah is more commonly knwn as the Old Testament to Christians, it's the five books of Moses, here is more information