Home Depot 3' x 3' sheet 26 ga aluminum:
http://www.homedepot.com/p/t/100351161?storeId=10051&langId=-1&catalogId=10053&productId=100351161&R=100351161#.UTqn9YeReo0
Home Depot 20" x 10' roll of aluminum drip edge flashing with red stripe:
http://www.homedepot.com/p/t/100071450?storeId=10051&langId=-1&catalogId=10053&productId=100071450&R=100071450#.UTqosIeReo0
Flashing is much cheaper and 0.0092", it's just a bit more than thick tin foil.
26 ga is 0.019", twice as thick, less thick than a 22 ga jumper pin.
But how about this (except for the price):
http://www.homedepot.com/p/t/202509274?catalogId=10053&langId=-1&storeId=10051&superSkuId=202939024&N=5yc1vZbrdg&R=202509274#.UTqrVoeReo0
It'd be snap, just don't scratch it up!