I've been wearing glasses since I was 10. That's a long time.
At this point a typical pair of nice (nothing fancy) glasses, plastic lenses, wire frame, progressive bi-focals, anti-scratch, etc around $400.
Buy 2 pairs a year, etc it adds up.
About 10 years ago I started buying my glasses from China. The last pair cost $82, shipped to my door.
This company in San Rafael, Calif is their American rep. I think it is the worst customer service of any company I have ever encountered. In my 10 plus purchase they screwed up a couple of times. I always either got my money or the product but when they screw up it takes perseverance. And if you speak with them on the phone they will lie to you without a thought.
So now that I've shared the good and the bad you're free to make your own decision.
http://www.zennioptical.com/