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"On the real, spy glasses are old hat, but building a set on your own for under $40 is most definitely notable. An engineering fellow has managed to do just that by snagging a micro camera from eBay for around $18 and wiring it up to a $20 pair of Solar Shield shades. From there, he connected the camera to a pocket-friendly MiniDV camcorder -- which we're sure could be done wirelessly for those with extra time -- and continued on to snag quite a few questionable reels of footage from a day at the beach. Of course, you won't find us recommending that you let your inner voyeur loose or anything, but feel free to tag the read link for all the instructions you need (and a video to boot)."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/01/13/diy-spy-sunglasses-cost-just-40/>