Vivotek TC5331 Wireless IP Surveillance Motion Detect Network Camera for $14.99 shipped. Here is a screenshot for your reference. It has a compact size and up to 30 frames per second in full VGA resolution. This is obviously not a top-of-the-line motion detection camera but it’s an inexpensive way to play with one.
This deal has expired as it is now out of stock. Congratulations to those able to get in on it.