A quick search on McMaster-Carr gave this possibility: Link: https://www.mcmaster.com/shims 18-8 Stainless Steel Shim Stock 6" x 50" x 0.0005" Thick = $34.03 6" x 50" x 0.001" Thick = $13.38 There are other varieties of metal and sizes, depending on exactly what you want. In any event, you have at least one reliable source. Crazy Bob