Right when we thought the T-Mobile Comet was the cheapest Android phone, at only $10 under contract, we learned today that you can get the black version of the LG Optimus T for the unbeatable price of free with a new two-year agreement from T-Mobile. Both the burgundy and titanium versions are still $29.99 each, but if you don't care that much about color, we definitely recommend getting the black one as it offers all the same features.
As a reminder, the LG Optimus T is billed as an entry-level smartphone, but you still get quite a healthy handset. It ships with Android 2.2, has both Wi-Fi and 3G, and it can act as a portable Wi-Fi hotspot. The only caveat is that the black Optimus T is Web-only, so you might want to click "Add to Cart" before T-Mobile comes to its senses.