http://dollardays.com/wholesale-office-and-school-supplies.html -They have free shipping on school supply items. Add $20.01 or more to your cart, and enter coupon code: DOLLAR20 to take $20 off. These have a good chance at getting cancelled though..

you need use .edu email to sign up account!

http://www.amazon.com/gp/student/signup/info?tag=httpwwwblac07-20&prv=httpwwwblac07-20

You need a valid .edu email address and you can begin posting books you need and books you have but are finished with. Our site will match you up with someone who has the book you need and then they will ship it to you for free. You will also be matched up with someone who needs a book that you’re finished with.

There’s a built in credit system that lets you receive a book for every book that you give. But right now when you sign up you get a credit for FREE…which means you can basically get a free book.

The more people that use the site the more books people will receive for free.

Link