If your in U.S.A try F1 specialities in Nevada, ask for Norm he is very Knowledgable.
If your after reference try Chaters. Just type Chaters, and search on your internet provider.
Whilst writing, I have thought of another source for models its Surf City. They are particularly good for resin multi-media kits. Your question is not that informative as to your specific requirements, so I hope this is of help to you. Good luck!!!!!!!.......