I think you're talking about aluminum. I have never heard HD or Lowes stocking any SS mesh. I have asked around with no luck.Local hardware stores carry it. OSH you can get it by the foot, but at lowes and home depot you go to the screen door section and you can buy it in big quantities to last a lifetime. They sometimes have a display that shows the differnt kind being either fiberglass or aluminum.
There are the types that come in like a 5 foot wide roll, and the other kind that is about 4'' in width.
I think the idea is to get an all in one where you wont have to add any weight to the product. SS mesh is the only material I can think of that is heavy enough and will not leak anything into the tank. I have used the stainless steel strainer before but I wish they sold squares individually instead.Why not get fiberglass mesh? It's much cheaper. The same stuff we use to lower lighting on some tanks.