This is the Robot Marketplace: http://www.robotmarketplace.com/product ... _main.html
The prices aren't to bad, I don't think, but it will take a bit more skill than just putting it together to use these materials. ESPECIALLY carbon fiber. But when done right, the looks, and durability are FAR worth it. Bike chain makes a great accent, too
.Its also a great place for wires, but the link I supplied will take you to the "Metals/Materials" section.
Hope this is of some use to you guys.