I get my glasses from the canadian version called clearlycontacts.ca
US one is here:
Contact Lenses from Coastal Contacts - your Contact Lens Store
Dirt cheap and great!!!
I just got a pair of transitions, and a pair of sunglasses for a grand total of about $200.
I have another pair of regular glasses from there that I spent about $50 on.
The ones I got from the optometrists were $600 for my sunglasses, and $400 for regular glasses. So yea... check out that website!