Bill, try Howard Wire Cloth, (510) 887-8787 (they're in Oakland,
CA). They fabricate wire cloth and screen in ferrous and nonferrous
metals. Their catalogue mentions "silver" on the page having to do
with custom weaving, but I don't know if this would be a stock item.
I've ordered stainless, brass and copper products from them; no
complaints. They do have a minimum order requirement.