At the first of the month, we highlighted the $200, Google-optimized PC available at Wal-mart. If you are contemplating a purchase, you might need to hurry. A note at Slashdot indicates the Linux-based PCs are flying off the shelves.
And if you're interested, another Slashdot post offers this tidbit about the "green" Everex gPC:
It works blazingly fast on Ubuntu with the Enlightenment Window Manager.