EPRacing had a carbon fibre bonnet for sale at JAE. Val had a good lokk at it said the quality was impressive for a style one and at a good price. Check the traders section
http://www.350z-uk.com/forum/viewtopic.php?t=7440
Speak to Holdcroft or Mr.F if you are choosing to buy a OEM new one. You also get forum diso**** so could save a few pennies.
Or why not look at a aftermarket one like Nismo or Aerosync. There are plenty to choose from.