Amazon.com is offering a 3 month free trial of their Prime membership right now with select textbook purchases. This is normally a $79 fee, but you can get the membership by spending $1! You can immediately turn off the auto upgrade and renewal features. This service lets you get FREE 2 day shipping on any item. You can upgrade to 1 day shipping for $3.99.
For details on this offer, go here. If you have a gift card, you can use that!