After getting a rocket for my birthday, I saw a video on YouTube where someone attached a video camera and filmed the launch looking directly down the rocket. It was pretty neat because the rocket goes up quite quickly and you can see all the people standing around the launch and then see more of the surroundings. Then the rocket peaks out and you actually see the parachute come out, but it gets a little frantic as the rocket spins a lot on the way down. Still, pretty neat.
In the video, they said it was a gum camera because it was like a stick of gum. I went looking for a gum camera, hoping I could find something cheap (since you could easily break or lose the camera the first time you try it). I found a spy pen on eBay. It looked outwards from the pen, not directly down, and they seemed to go for about $20 shipped. I bid about $13 on a few of them, but never won. I looked around further and found the exact same looking pen at dhgate.com, a sort of Chinese version of Amazon for less than $10. You had to supply your own micro SD card for memory, but it came with a micro USB cable to read the contents. It claimed to be High Definition, but some reviews pointed out that while the resolution was high, really it was just VGA video at twice the size, but not twice the resolution.