For touch up paint, you can buy factory colored paint specifically for your vehicle. here at this site.
http://www.automotivetouchup.com/
Just plug in your make and model and paint color and make sure you include if it is metallic or not and then select the application type. Because you need a spray you would order it in the spray can. Also note that you will need a clear coat to cover it to make it look factory. they offer that too. Just take your time when sprayng the pigment and clear so it doesnt run and you will be fine.