How much will it cost to fix a cracked taillight on a Ford Truck?

Ok, so I recently got my G2. Very good driver, passed with high marks, and have been driving a lot lately, with no accidents or incidents what so ever. So today, my dad told me to take his truck and go to the forest and while reversing at the top I accidently backed into a pole cause there were 2 dogs running around and I couldn't see it, and immediately put on the breaks as soon as I heard it hit.
There's now a small crack in the side of the drivers-side tail light, and a small piece of the plastic that holds the light is gone. The actual light is fine and works its just the plastic around it.
I'm going to tell my dad (although I'm terrified too) but how much will it cost to fix the outside plastic part of the light? Please let me know roughly, and quick would be good too.

I love it, you blame the dogs. You seem to be able to get online you just don't seem to be able to Google, is your smart phone restricted?

So you're speaking of the lens. Best bet is to look at evilbay. Even the knock-off after market products for that app will be just fine. Save a few bucks that way. Just ensure the rubber seal is intact when installing your new one.
in the interum, any auto parts store will have red lens tape you can apply if there's any white showing through the cracked lens. That would be illeagal. Aviod tickets that way 'till your lens gets shipped to your door.
my guess on cost depends on exactly which lens you're speaking of. Typical to the platform. Could run from 5-15-20 bucks maybe. Tip; look for a seller that provides free shipping. And check their seller history for satified buyers. Or any customer issue you might want to aviod.