The OLPC [One Laptop Per Child] starts their buy one, get one program starting on November 12, 2007. Production has started on the laptop systems and this offer is being made to those who reside in North America only. On their web site they state:

If you’d like to donate an XO laptop today, simply click the donation button on the right, above the photo. A donation of $200 will pay for and deliver one XO laptop to a child in a developing nation, $400 will pay for and deliver two XO laptops, and so on.

Starting November 12, One Laptop Per Child will be offering a Give 1 Get 1 Program for a brief window of time in North America. For $399, you will be purchasing two XO laptops—one that will be sent to empower a child to learn in a developing nation, and one that will be sent to your child at home. If you’re interested in Give 1 Get 1, we’ll be happy to send you a reminder email. Just sign up in the box to the left and you’ll receive your reminder prior to the November 12 launch date. 

You can join the program linked here if you wish to make a donation.

[tags]olpc, donations, buy one, get one free, [/tags]