Pricing otherwise starts at $429, according to the Samsung product link below
“To help budget-strapped classrooms across the country, we’re working with DonorsChoose.org, an online charity that connects donors directly to public school classroom needs. For the holiday season, teachers can request the Samsung Series 5 Chromebook—the most widely deployed Chromebook in schools—at a special, discounted price of $99 including hardware, management and support.
If you’re a full-time public school teacher in the U.S., visit DonorsChoose.org and follow the instructions to take advantage of this opportunity by December 21, 2012. Your request will be posted on DonorsChoose.org where anyone can make a donation to support your classroom. When you reach your funding goal, you’ll receive your Chromebooks from Lakeshore Learning, DonorsChoose.org’s exclusive fulfillment partner for this program.”