I have a lot of aluminum foil 0.3 mm thickness that I wouldn´t be able to use up even in the next life.
I could cut it to sheets of 100 x 125 mm, or bend it, so it fits a letter and costs 1.50 Euros shipping.
For a sheet of the aluminum ( = 2 pcs. ) I want 1.50 Euros.
The alu is alloyed, ie.e it is not supersoft but stiff enough to use it for many things.
Roland