replacement decals?

Hello all,

I am new to diecast modeling but have some experience with plastic modeling.

I am going to strip and repaint a diecast, and I realize that the decals add a great deal of realism to the cars. I am hoping to find a source for new decals, but am not sure where to go for these. For the record, I am doing a Bburago Audi RS 4, not a common car, so I figure aftermarket decals may not be common.

Thanks in advance for any suggestions.