Craigslist
Forgot to mention the specs of the Touchpad were quite decent. It's running a Tegra 2 at 1.2MHz and it comes unlocked and rooted. You can bump up the MHz to 1.5, where it's normally supposed to be.
As for Android, you can run Cyanogenmod. It comes in a Gingerbread flavour (Alpha 3.5) or ICS (Alpha 2). Personally, I'm keeping it on GB Alpha 3.5 as that seems to have less issues than the current ICS build.