I don't get it. I just tried a few online "cheap glasses" places. I want single vision, prescription (relatively low strength, nothing exotic), polarized sungl

I don't get it. I just tried a few online "cheap glasses" places. I want single vision, prescription (relatively low strength, nothing exotic), polarized sunglasses. Fashion doesn't really matter, it is just for driving. zenni: $25 frames, cheapest polarization option: $67.89 eyebuydirect.com: $42 frames (malibu), plus polarization: $92 39dollarglasses.com: $39 frames (houston), cheapest polarization option +69, total $108 (more if I want anti-glare) While these prices are better than my optometrist, where are people finding these "I got three pairs of prescription sunglasses for $50" stories?