BLACKFRIDAY
Thought this might be worth mentioning.
I am no expert on glasses, but used Zenni for some cheap temporary prescription glasses for my kid (for when she loses/damages the expensive ones from the optician). I was quite surprised at the high quality for what you pay, and Zenni appeared cheaper than comparable online sites, especially when taking into account things like glare protection, scratch protection, higher quality lenses, etc.
One thing in particular I like with Zenni are the cheap sunglass and 3D-movie clipons you can get, as well as name engraving.
Delivery took about 4 weeks.