ITead started offering chemically etched stainless steel stencils. They’re usually used for easy solder paste placement on SMD boards.
They recommend their stencils for SMD components with a pin spacing greater than 0.5mm, and passive components in 0603 packages and above. Stencils are 0.1-0.2mm thick, and are supplied with supporting frames. Available frame sizes range from 30cmX40cm to 50cmX150cm.