The black glasses that skrille wears is so expensive because it belongs to the big brand. You could find the similar type of this kind of eyeglasses online. And the price online is cheaper than those in the eyeglasses stores. And you may have more choice. The quality online is also proved only when you go to the famous online store, like Walmart .
The black eyeglasses like skrillex wear is a very common one. You can see it at almost every eyeglasses shop. If you want to buy affordable one to save money, you can try to order it online. Usually, they are cheaper in online shops than they were in real shop. Good luck.