Amazon coupon code for textbook purchases (back to school special!)

Amazon has a coupon for free 2-day shipping when you buy $200 or more worth of qualifying text books. If you are a Prime member (and you already get the free 2-day shipping), then you will receive a $20 promotional gift certificate for a future purchase! The promotion code is TBFALL07 (enter this at checkout). There are restrictions with this offer. Visit Amazon and comparison-shop your textbooks!