The paint manufacture is PPG. If you look under your hood (on the hood) there is a sticker stating the name and possibily the paint code of your hue.
Got to any body shop that uses PPG and ask to purchase some touch up paint. Hope this helps.
I once had a Maserati rep call and ask me what I did for touch up paint. I told him there was none available. He said what do you mean, I said Maserati the manufacturer does not provide touch up paint for its vehicles.
I had a local body shop (but one that works exotics, the owner has a Pantera) match a small replacement part on my GS - came out perfectly. Took a couple of calls to ensure the right # for the color. They didn't even charge me but I tipped the paintmaster $50.