I buy a lot of stainless steel cooking and serving pans used by the restaurants that end up at the local recycler. Don't know why but they sure do get a lot of them.
They are very well made too handle heavy loads and come in many handy sizes
Every time I go to get scrap lead, I look in the stainless bin for a pan to carry it in.
The big cookie sheets are great for numerous thing also and I usually get them for about $3 each.