Sheet metal

Anyone have any hot tips for where to buy sheet metal for auto panel repairs?

Do you recommend aluminized metal like they sell at Eastwood?

Their kits are $40-50 for (it seems to me) not a lot of sheet metal. But it is aluminized....worth it?

Old cars used to be 18 gauge but will the now common 20 gauge work for repairs/welding in?
Author: shadango