Carbon fibre and cheap just don't go together.
Alternatives are ebay seller carbon-tech who can make up custom sheets for you. Just email him for a price
http://myworld.ebay.co.uk/carbon-tech/
Carbonology
http://www.carbonology.com/shop.asp?...78&sec_id=2116
But be aware the listed sheets are single sided gloss, you need to contact them for a price if you want both sides glossy.
Fibretech
http://www.fibretechgb.co.uk/Rods.htm