The closest sample exams I actually had experience with was NCEES and the MGI sample AM & PM exams. I did not use CAMARA or KAPLAN so I can't speak for them.
NCEES also had other sample exams for the old format that when broken down were pretty similar. By broken down, I mean Question #1 had parts a-f, and any letter part of the problem, stan alone, was similar to a new forma question. The IEEE PE Review videos, availible from IEEE at a hefty $220 each or $660 set, uses these lenghty problems in the video. As for where to get the actual book that they use, I don't know.