How bad is it? Having it repainted properly is probably going to run you into a couple hundred dollars. An alternative is powdercoating, which costs less and is tougher, but you're still looking $150-200 for a proper job.
As far as touch up paint, best bet is to take it with you into an auto paint shop, and see if you can find a bottle that matches. Others suggest nail polish as a decent touchup, too, due to the incredible variety of shades available.