Since people have started realising carbon fibre ain't the black art it's made out to be, there's an awful lot of tat floating about ebay. Personally, I think it's all a bit passe these days.
some of it it buy some of ut is still a work of art. the most impressive carbon thing I own is a pair of carbon pedals on my road cycle. it is carbon quite unlike any other i have seen. a high pressure injection moulded looking thing, and yes they definitely are carbon.
