Once a month i go to the scrapyard and always take something (sheet metal, aluminium bars, they also have some plastics (great for engraving...)
It's only 4 euro a Kilo for aluminium. So most of the time when i come up to the guy i have already weighted it and say, ok this is 3KG and he says: 10 euro ?
They also have a circular saw which i am allowed to use now (mainly used for metal bars but i last cutted a sheet with it too ;-)
Scrapyards rule.
I didn't fail !
I just found out 10,000 ways that didn't work.