If you go to a local automotive body supply store, they may be able to custom mix you your paint and fill it into an aerasol can. I know there's sites out there that you can order pre-matched factory paint in not only regular 3 stage paints, but also in rattle cans. I'll see if i can find the link for ya. I know my DWB color was like $30 for a can.
Josh's link is the link i was looking for.