The front air dams are pretty easy to fix. They have nut plates on the inside of the dam, and it just bolts on from behind. There is only about 4-5 screws. It only takes about ten minutes to replace. Mine made the journey from Vermont to Nebraska in my passenger seat cuz it fell off in Vermont, and I didn't have the time to fix it just then.
I don't know what you have otherwise I would havee looked for a price on a new dam, but you can try BMP Design or Bavarian Autosport to see what they have and prices. Good Luck!