$50 is still kinda steep, but considering that people are trying to push common 8-Bits on eBay as "rare" and inflating the price, it's not too bad.
http://www.engadget.com/2009/03/30/8-bit-computer-now-available-for-all-your-homebrewing-needs?icid=sphere_blogsmith_inpage_engadgetPlus, I don't understand the push for a $100+ laptop for third world countries. In some areas, the concept of computing is so foreign, that it would be like getting grandma an iMac so she can see "the pretty pictures on the photo frame they bought me". There is sooo much good 8-bit software out there that helped to educate my generation. Why not go with a proven platform, like the Apple II series, make it a system on a chip, and send them off with stuff like Math Blasters and Carmen Sandiego?