A few years ago I found a technique on youtube to help myopia by wearing slightly lower prescription glasses. And the author recommended zennithoptical.com for cheap glasses. I was almost shocked to find their price to be that cheap. And when I bought a couple of pairs, it turns out their quality is quite decent.
I have since bought more than a dozen glasses from zennithoptical.com, at a total cost of about $300. And by using the technique, the prescription on both of my eyes dropped by 1 (from -5.75 to -4.75). Unfortunately that seems to be the limit of that technique. But I was extremely happy to find a source for cheap yet good glasses. Now I have two normal prescription pairs for daily use like driving, two more pairs for reading (1 for backup for each).
So the cheapest way to get glasses now is to get a prescription at Costco (cost about $40), then just buy your glasses online.
I have since bought more than a dozen glasses from zennithoptical.com, at a total cost of about $300. And by using the technique, the prescription on both of my eyes dropped by 1 (from -5.75 to -4.75). Unfortunately that seems to be the limit of that technique. But I was extremely happy to find a source for cheap yet good glasses. Now I have two normal prescription pairs for daily use like driving, two more pairs for reading (1 for backup for each).
So the cheapest way to get glasses now is to get a prescription at Costco (cost about $40), then just buy your glasses online.