$20 · Small piece of sheet aluminum flashing or stainless steel

I am looking for a piece of thin aluminum sheet or thin stainless measuring at least 2' by 4'. It can be mill finish or painted if used, as long as it doesn't have too many holes or wrinkles. Something left over from a roll of flashing would be ideal - I can't justify buying a whole roll, but I could help defray your cost if there is some leftover from a 2' or 4' wide roll. Maybe you are discarding a stainless steel wrapped appliance - I could remove the door panel before you dump it.