Round glasses now are everywhere. If you want to buy vintage style round glasses, you can search it online. I know there are some sites that have specialty in retro vintage style eyeglasses, of course, including round glasses. For example, you can find many vintage round eyeglasses here: https://www.wowvintage.com/Round-Glasses-s/126.htm. Or you can search it from www.ebay.com or www.amazon.com
round glasses are good eyewear choices. At these two sites, you can find round glasses that are very vintage. But they are more than one hundred dollars. If you want to buy cheap round glasses, you can search the Wal-Mart, amazon, or ebay. By the way, you may get the chance for getting round glasses for free because sometimes there are some sites offering free eyeglasses. Good luck.