This deal has ended.
Through 7/8 only, Groupon offers a $60 Voucher For Glasses From CoastalContacts.com for $19. CoastalContacts.com is the world's largest optical store. Glasses start at $38 and the average checkout price is just $100, so this will most likely take care of the bulk of your order. Note that there is a limit of 3 vouchers per person, which will be valid through 11/9. Note that it can be used by anyone despite being listed for Columbus, GA.