Right, no reproduced '68 Fenders yet. And in these uncertain times, I wouldn't expect to see any anytime soon. There may be some Fiberglass ones out there, but I would say that they would pale in comparison.
Good used would be your best bet. I sold my last good one a few years ago. Try Desert Valley Auto Parts in AZ or similar yards with dry weather conditions.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America