Search discount eyeglasses online are much easier than local stores. Just put discount eyeglasses in Google, it will show you some eyeglasses stores who are proving discount eyeglasses. Or, you just search some reliable glasses shop and then search discount eyeglasses directly from their sites.
In fact, If you just want to get a pair of eyeglasses at cheap prices, you needn't just search discount glasses. There are some glasses shop like firmoo.com carries eyeglasses in low prices. Most of their eyeglasses are less than 50$. Some of their eyeglasses are only sold 10$. You can have a look at their site.
Many online optical stores offer discount activities on eyeglasses. You can search them in the web broswer like goggle with key words "discount eyeglasses" and then there will be some online optical stores which are giving discount eyeglasses appearing on the first page. All these online optical stores or sites are reliable, you can compare them with quality, price and service to find one that can meet your needs. Good luck!
You can surf some official websites of glasses boutiques, looking for discount or promotional news. Then go to the hypostatic stores to get the one you find online. Besides, there are a lot of online stores providing more choices for you. Generally speaking, there are more promotional activities offering a lower discount. In the meantime, you can also try them on and have the glasses with the same quality. One more thing I have to say is that some online stores are offering free glasses such as http://www.coastalcontacts.com/. These free glasses are aimed at new users and those who didn't buy anything on the websites.