No Costco. I checked out the Walmart and I was not impressed. Another friend is swearing by Zenni Optical. I could get exactly what I need for 10% of the cost of getting them at Lenscrafters.
Problem is, with me, is that I have a bent nerve in my right eye, so I need checkups and new lenses quite often. No, I don't have Glaucoma. But I have really shitty eyes.
edit: in fact, I can't see much with my glasses off at all. Colors and shapes if they're big enough and close enough to my face. Literally, if my glasses aren't on, something needs to be right in front of me.