Last week after a long wait I finally got my Linkit Smart 7688 boards:
No, not $5.00, but at $13 from Seeed Studio it's not too bad. The killer was that they shipped from Hong Kong and that got pretty expensive. And it has built-in WiFi. A little strange in that it runs OpenWRT instead of Debian or some standard Linux distro, but it looks like it will be fun to experiment on.
Something tells me we're going to see a lot of these cheap little computers in the coming months, especially as smartphone sales level off.