Just picked up a set of front headlight covers off Amazon.com (dark smoked GTS units to match my taillight covers) for $45.00...sweet!!

I think the original post was for replacement glass for the headlights though . Since these are all part of one unit you can't buy just the glass(plastic) replacement...you have to buy the whole light assy. and that gets expensive!! I have seen a few on e-bay that went for over $100.00 a piece. The dealer units are 3 times that price(each).
Your best bet is to go and get some plastic rubbing compound and polish to try and remove some of the scratches yourself. There have been a few posts here about that same issue.
John