Reddit reviews 110 Copper Sheet, Unpolished (Mill) Finish, H02 Temper, ASTM B370, 0.043" Thickness, 12" Width, 12" Length, 19 Gauge
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110 copper has high conductivity and formabilityMeets ASTM B370 specificationsUnpolished (mill) surface has no finishH02 temper has been cold worked to a 1/2 hard temperStandard tolerance
Here's a 12"x12" sheet that is a little bit thinner than a penny:
http://www.amazon.com/dp/B000H9N44I/ for $36.70
Cutting out a box pattern with tabs to join the seams would provide enough structural integrity. Making the lid might be a bit of a trick though.