You can also melt them, and sell them on ebay for a premium:
aluminum ingot | eBay
Hobbyists are always looking for good supplies of high purity Al for their casting.
You can make even more if you learn how to sand cast or lost wax cast Al, and can make custom items, but that's taking what you are wanting to do a little far for this thread I think.
I am seriously thinking about casting Al bars for hobbyists from cans myself, it's super easy, relatively inexpensive, and adds to the bottom line.
Scott
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