GMAT BOOKS (Lots!) - $10 in Toronto, Ontario for sale

The whole batch is yours for $100 (with only most recent OG)

GMAT Official Guide 13th Edition ($35)
GMAT Official Guide 12th Edition ($25)

Manhattan (MGMAT) Complete Strategy Guide ($60 for set or $10 each)
Fractions, Decimals, & Percents GMAT Strategy Guide, 4th Edition
Algebra GMAT Strategy Guide, 4th Edition
Word Problems GMAT Strategy Guide, 4th Edition
Geometry GMAT Strategy Guide, 4th Edition
Number Properties GMAT Strategy Guide, 4th Edition
Critical Reasoning GMAT Strategy Guide, 4th Edition
Reading Comprehension GMAT Strategy Guide, 4th Edition
Sentence Correction GMAT Strategy Guide, 4th Edition

GMAT Official Guide Verbal Review (2nd Ed.) $15
GMAT Official Guide Quantitative Review (2nd Ed.) $15

Princeton Review, Cracking the GMAT (2007) ($20)
Kaplan Test Prep, GRE & GMAT Math Workbook 3rd Ed ($20)
Cliffsnotes Math Review for Standardized Tests 2nd Ed ($10)
Cliffs GMAT Preparation Guide (Bobrow) ($10)

Also have some LSAT and PMP material if interested. I wrote the GMAT twice and am happy to chat about study plans and stuff if interested.