Dear TIGeducators in the USA,
I just learned about Computers for Learning, a program supported by the General Services Administration which supports the transfer of computers and related peripheral equipment from federal agencies to schools and some educational nonprofit organizations. For more information about the program, please visit:
http://computersforlearning.gov/
"Transferring computers to schools/education nonprofits extends the useful life of the computer, helps a needy school, and contributes to a cleaner, greener environment."