Sunglasses are one of those things that are nearly impossible to find without a 2000% markup. I'm too lazy to do the research. Tell me your nerd secrets.
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ackshually this isn’t quite right
The dangerous thing is to buy tinted glasses that are not UV protective. Your pupils will dilate in response to reduced visible light, in turn increasing your exposure to UV light.
Unpolarized glasses are safe. Indeed many expensive sunglasses are unpolarized, for example those worn by athletes or pilots.
What polarization does is cut down on glare by using a vertically polarized filter, letting in only light near vertical (and dimming like the sine of the angle from vertical). Light that reflects off surfaces like roads and water will be horizontally polarized and therefore almost completely blocked. This helps with comfort, but that’s about it.