Well here ya go...
Autozone or Checker seem to be the best place to get them... Just about every place sells them; Wal-Mart, Target, K-Mart, and specialty shops all carry them.
The bulb number is 168 or 194NA (Clear and amber, respectively)
If you are aiming to get them to match your headlights, I would suggest getting some that are LED. The reason is that the headlight bulbs usually have more of a blue tint to them.