I have 8 spare pairs of glasses! I ordered them a few years ago from Zenni.com when they had a BOBO sale. Optically they're pretty good. The most expensive pair is titanium framed and was still just $80 for the pair, and the entire order was under $200. One of the styles I got doesn't fit my face that well but for the price I can't complain. Now I have spares stashed everywhere, a necessity when you're as nearsighted as I am.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman