No, I don't know the price of a replacement facia. I can guarantee that repairing it will cost a lot less. No, Alfa won't warranty this :wink2:
Consideringthis is an area that's subject to lots of scraping, and it's almost not visible, you might consider leaving it alone.
Mine is also scraped, and much more visible than yours. I wish it wasn't all scratched up, but it's part of the cars history now. I'm not even sure how it happened. It wasn't there when we started driving, but there it was when we stopped. Neither me or my wife were aware of anything that might have done it.