Ok, it seems that you like the type of sunglasses that marc anthony wears. So, it is true marc anthony likes wearing different kinds of sunglasses from time to time, typically his choice is aviator sunglasses, and he looks awesome with them during his concerts. Anyway, those aviator sunglasses are quite popular and pervasive in the world, so you could get a lot of them at large optical stores, or some online stores ,such as Amazon, or eBay, here is a link for you.
So, this might be the one he chose on one of his concerts, ray ban,,
http://www.amazon.com/Ray-Ban-RB3025-Aviator-Non-Polarized-Sunglasses/dp/B00080FK2U/ref=sr_1_2?ie=UTF8&qid=1355997016&sr=8-2&keywords=aviator+sunglasses