What is an LSAT PrepTest and where can I get them?
Official LSAT PrepTests are previously administered LSATs that the Law School Admissions Council (LSAC) has released for sale. After examinees' scores are released, the June, September/October, and December LSATs are published as new PrepTests, numbered from 1-68 (currently). February LSATs are generally not released. Zen of 180 considers PrepTests before 19 to be sufficiently different from modern PrepTests that you should avoid using them unless you run out of practice material.
Helpfully, LSAC has made the June 2007 LSAT available as a free sample. In the table below, we've identified all the cheapest places for you to acquire the various modern PrepTests, and--not surprisingly--we offer some of them. If you're just getting started, the 10 New LSATs from Amazon are your best bet, as it has PrepTests 53-62 for only $20.