Where to source recycled stainless steel in the U.S.?

Hi – I'm designing a watch case that I'll be making in my studio for a limited edition watch. I want to fabricate the case back from recycled stainless steel. Any tips about where I can source the material in the U.S.? The recycled aspect is very important to me and to my brand. I've had little luck via Google searches.

Thanks in advance!

Wesla