For paint, have a look at autocolor library. They will mix in their house brand single stage and PPG. Single stage and base/clear. Color match was good for me on my Mopars (plum crazy PPG + late model dark red in house brand) and a non metallic Ford (non metallic single stage in house brand).

For single stage metallic... a comment. Most full time body men cannot spray the stuff today. It is very hard to get the metallic to lay down correctly. I know I cannot. Base/clear is much easier with metallic.

Good luck!

http://www.autocolorlibrary.com/