All the newest exams from prepTest 39 - prepTest 49 are published in individual booklets.
The Official PrepTest 48 (Official LSAT PrepTest) (Paperback) http://www.amazon.com/Official -PrepTest-48-LSAT/dp/0976024543/sr=8-2/qid=1172091653/ref=pd_bbs_2/104-5636811-8971120?ie=UTF8&s=books
The game book from powerscore, a lot of people found this useful. But for me, it didn't work. I liked to figure out on my own.
The PowerScore LSAT Logic Games Bible (Paperback) http://www.amazon.com/PowerScore-LSAT-Logic-Games-Bible/dp/097212960X/sr=8-12/qid=1172091653/ref=pd_bbs_12/104-5636811-8971120?ie=UTF8&s=books