Hey!
For those that own GoPro (Hero 1, 2 or 3), check these anti-fog inserts for about half the price of the GoPro branded stuff:
http://www.ebay.com/itm/FogFree-Anti-Fog-Inserts-for-GoPro-Cameras-/180950069755
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Exactly same material and it comes with more inserts per bag.
Cheers!