In the past I would buy cheap under 30 dollar sunglasses..
The most I spent was 50 bucks on some Wiley X.
But recently I bought some micheal kors, they were like 120. They were nice. I gave them away to a girl. I'll probably get me another pair of the same.
Then I bought some ray ban aviators, they were like around 130 as well.
Anyways, the thing is...you can really tell a difference in quality. There really is a differencephal itis.