There was a company here, JYS Group, Phantomview that had a slick camera but no one bought it. It was around $275 and it ran a continuous loop of around 20-30 minutes. You just hit a button and it would save the last 30 seconds.
I never got around to buying a couple from them.
Found a link. http://www.jysgroupinc.com/
Let me know if you can get a deal. I'll take two.