There is a place where you can pledge to purchase one of the OLPC laptops for $300 if 99,999 other people also pledge to do so by Oct 31, 2006. With that $300 purchase, you'd be getting one of the laptops for yourself and funding two more for the children elsewhere who are the focus of the program.
I'd recommend pledging. It was featured on Slashdot a week or two ago and got a big spike in pledges, but it's tapered back off. Projected pledges by the deadline are about 7,000.