Tax-free books-Amazon.com

Tax-free books-Amazon.com

I'm starting college this fall, & at orientation, they told us that (thanks to Obama) anything required by a professor could be purchased tax-free, including text books. I'm about ready to start buying books, & I've gotten what I can on craigslist & other local sources, but there are still a few I need. I've found copies of everything on Amazon.com for almost half-off the used price at my school's book store, but I'd still like to get the sales tax discount. I'm wondering if anyone knows how to do this, has done it, or if they lied to me & this is all bullshit XD I figured if anyone knew, this would be the place. Thanks!
Plant Identification Help Please

Plant Identification Help Please

Intro and a few questions

Intro and a few questions

Wildflowers all over my neighborhood.

Wildflowers all over my neighborhood.

Curtain Panels

Curtain Panels

Wall color help!

Wall color help!

New blooms

New blooms