I highly recommend zenni (its an online dealer). Way cheaper than the eyedoctor's office for better quality. If you need prescription that is.
Also goggles4u.com, eyebuydirect, there are a few more.
Read their instructions on frame sizes so you know what 52-17-140 means, and then go to any glasses shop and try on frames paying attention to those numbers. Once you get this down you can buy glasses online and you'll get it right.
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