DDAWG I wouldn't use the link above to buy carbon fiber plate. The stuff listed is mostly fiberglass with one layer of Carbon fiber on the top and bottom of the plate, in any plates thicker then 1mm. The 4mm plate only has carbon fiber on one side. If your looking for stuff less ten 1mm it would be ok.
Since the previous post didn't suggest a good place to buy carbon fiber plate, you could try contacting a company that makes r/c car chassis such as Calandra (http://www.teamcrc.com/crc/index.php) or a 3rd party company such as BMI Racing (http://www.bmiracing.com/). They might be able to point you in the right direction or possibly sell you what you need.