At the Spring fishing show you can get polarized shades for 20 bucks...I purchase from the same place each year... usually buy 2 or 3 pairs for the season.
If your like me with shades they always get scratched, bent, sat on, lost, twisted, stepped on, cracked, thrown in the fire, dropped in the lake, misplaced ... and so on.
I find buying a few cheaper pairs is better than buying one pair thats 100 dollars.