After staring at sticks and rocks, underwater, that I was SURE were "huge lurking-sulking trout" with polarized sunglasses for more years than I'll admit to here................. several years ago I "bit the big one" and forked over $49.00 for a pair of "Fitovers". With, case, cleaning cloth, etc.
I've gone the $5-$10-$15 route with sunglasses, but I get tired of "poor quality for the sake of cheap", with any of my fishing gear. I couldn't believe the difference between GOOD quality polarized glasses and "I'll save a few bucks @Wal-Mart brands".
Since I also wear eyeglasses, the Fitovers, brand does what their name implies just fine and then I don't have to buy expensive prescription sunglasses too. I also wear them at times, without my regular glasses and the results are the same.
With them secured around my neck with a "frog chord" I'm into my 3rd year with the pair I have, without loosing them.
I, also, love the "side shields" these glasses have, so I never fight with "side/rear entry glare", from odd angles.
The last time I checked, they came in "dark (green), "amber" and "smoke".
Sorry and MY opinion ONLY............ but if you're looking at "$150.00 for a pair of non-prescription shades" and "willing to go as high as $300.00", I think you're going to pay about 10%......... for what you're after to fish with and the other, 90% for pure "bling".
Like, Graphite and the super high prices on some of today's rods and Polycarbonate, the usual lens material in these sunglasses, "there is only so much a manufacturer can DO, with the materials" and the rest is "name slinging" and "what the market will bear".