Available at Mercedes, A 113 690 00 35. Yes, it does cost some money, $200 or so. But it is made of proper material, pebble structure, fits well, foam layer on the side facing fender, has all the necessary cut outs for what is attached to it. I bought it some years ago from Mercedes, it was less costly, but not much less.
About EUR 90 at SLS. I suppose not bad quality.