Here in Tyler TX, the place that sells metal, Tyler Steel, gives away scraps to me all the time when I'm looking for something specific. If they have it in their junk pile, they just give it to me. I would look up where people get steel in your area and go ask the guy at the counter if he could help you out. If he's smart, he will give you some pieces of scrap knowing that when you are ready to buy, you will be back.