I saved up and bought a CD burner ($800) when they first came out(grade 7) and started making mix CDs. At the time it was an untapped market because people only had mixed tapes, not CDs!! I had prepackaged Hip Hop, Rock, Alternative, etc. CDs and believe it or not, I charged $20 per CD. It turned into a pretty successful business just at school but then about 1-2 years later when prices came down on burners, the market became comodotized and I had to get out!
I'm now 21 and run a successful web-based start up based in Calgary. Curve Dental, check me out at curvedental.com or http://www.curvedental.com/docs/resources/april07_matt_calgaryinc-2.pdf