Used LSAT prep books: all the writing has been erased, some have never been written in.
Outside LSAT Advanced LSAT Practice: the Most Difficult Questions from Tests 1-28 (ISBN: 1). $50 (sold for $65 on Amazon)
PowerScore LSAT Game Type Training: LSAT PrepTests 1 Through 20 (ISBN: 6). $20 ($35 at bookstore)
PowerScore LSAT Game Type Training II: LSAT PrepTests 21 Through 40 (ISBN: 2). $25 ($52.50 at bookstore)
PowerScore LSAT Logical Reasoning Question Type Training: LSAT PrepTests 1 through 20 (ISBN: 3). $40 ($57.95 at bookstore)
PowerScore LSAT Logic Games Setups Encyclopedia: Volume 2: LSAT PrepTests 21 through 40 (ISBN: 8). $20 ($37.95 at bookstore)
PowerScore LSAT Logic Games Bible Workbook (ISBN: 9). $25 ($41.95 at bookstore)
PowerScore LSAT Reading Comprehension Bible (ISBN: 6). $40 ($69.99 at bookstore)
Or have all of them for $200.