All right I get you, I can see that you are quite interested in the type of sunglasses that slash chooses, anyway, those sunglasses are quite compatible with him and are called aviator sunglasses, which are quite popular in the world and could make him appear more awesome and amazing. Anyway, those sunglasses are quite pervasive now and you could get them at any large optical stores, or Amazon, where the prices and options might interest you.
It is the notable Ray-Ban Aviators sunglasses that slash wears. The sunglasses is so cool at the design and excellent at the quality. If you want to buy such type, you could go to the online store to have a search. You could go to the ebay or amazon to have a look. There must be such types.