You will find many retro glasses either in the real optical stores or at the online optical stores. I ever bought a pair of retro glasses from an online optical store which is Firmoo.com. I find it is very nice and comfortable to use. If you are looking for these glasses, I will recommend you to try this link http://www.firmoo.com/retro-vintage-eyeglasses.html
Today, black retro glasses are very popular. And they are everywhere. You can find them at almost every eyeglasses shop. But eyeglasses in real shop more expensive than they were in online shop. If you prefer to buy them online, you can have a look at firmoo.com, framedirect.com. Or you can search them at Amazon where you are expected to get good and suitable eyeglasses.
You can find retro black eyeglasses in any eyeglasses store or at online eyeglasses store. Personally, eyeglasses in local shop are usually sold at high prices. So, i seldom buy them in local shop. I prefer to search them from online eyeglasses shop. They are much cheaper online. You can also have a try. If you need vision aids, you shall know your prescription before you buy the eyeglasses online