If you really want to buy a couple of great Cobra DVDs, I would suggest the following documentaries:
- The Cobra Ferrari Wars, re-released as The Snake and the Stallion
- Victory by Design: Ford Muscle
I have both of these in my collection and have watched them over and over again. Gotta haves, in my opinion.
You can buy the first one from Cobra Country and the second one from SpeedTV or the Victory by Design website. They're probably also available on Amazon.