I had to replace one on my 2001. A big chunk of the lense was broke out. The light still worked. Could not find just the lense. Ended up buying the whole assy. to the tune of $151. :mj: Good luck. Like the last guy said you may try a junkyard. Might be a whole lot cheaper. :shrug:
I seem to recall there is another source but it's not a clear lens. You may try doing a search on the net. Also there is a mod on NHTOC where you can protect the lens a little. I never did it so I can't say what it was.