Try this place.

They custom mix and can do an aerisol
http://www.paintworldinc.com/

 

A very good, yet incredibly cheap ($6.00) tool for touch-up spray painting is the PRE VAL spray bottle which is a glass or plastic bottle with a pressure canister and a spray head. WAY better than any spray can I've used. You simply mix you paint and put it in the bottle. $25 or $65 for a can of spray paint? No way!