Sunglasses Cartier

How much would you pay for sunglasses?
Let’s say that the sunglasses are really cool, but they just aren’t
“Cartier” or “Gucci”. How much would you pay?
I wouldn’t spend more than $15. I don’t know how people can spend hundreds of dollars on a pair of friggin’ sunglasses! Can anyone really tell the difference between a walmart pair and a designer pair?