This is the link to the LSAC page where you can get almost all of the published preptests.  The most important things to get on that page are the publications of the actual tests.  If you're going to be preparing by doing as many preptests as possible (which you all should be doing) then the best/most economical thing to do is to buy the four bundles of 10 tests and individual copies of the most recent tests that haven't been released as bundles.

Official LSAC Store

 

Here's a link to a company that has all of the published tests in electronic format.  Once you buy it from them you need to print out the tests.

Cambridge LSAT

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