You can see whether there is the eyeglasses store around your living place. However you could buy the dark sunglasses online which may help you save a lot of money and energy to go out to search. The Walmart online store is such a good place where you could buy the eyeglasses. The price there is suitable and the quality is good.
If you don't know where to buy super dark sunglasses, you can search it online and order them. You know, almost everything can be purchased online. And i just search it on Google, and i find some super dark sunglasses. Just click the below links: https://www.ebay.com/sch/i.html?_nkw=super+dark+sunglasses, https://www.anysunglasses.com/Super-Dark-Sunglasses.html .