Where are you based? I have brought off a company based just outside of Bracknell. They are mostly a Fiberflass workshop..... But because they buy at trade prices - they sell onto me (and I guess anyone else that asks) at a price that is inbetween trade and what other people sell it for.
I'll dig out the contact details and provide tomorrow. But they are very helpful and friendly and have stopped me from making some costl errors
I feel like I owe them --- hence the recommendation