they're included when you sign up for the kaplan class, online only is around $1,600, classroom version is maybe 175 more than that.
If I were doing it again, I'd pay instead for the 8 or so aamc tests at $35 each, and go with examkrackers' books at $175 + maybe some of the other books recommended on this site. Possibly in addition, buy the kaplan book at around $100.