On Tue, 17 Apr 2012 03:46:25 -0400, Chris wrote:

I'm looking for thin pieces of stainless steel for making custom
calipers. Kind of like these:
http://www.quantumbalancing.com/goldenmeantemplate.htm

I'm guessing that 5/16" to 3/8" wide would do it. Thick enough to
discourage bending from casual use.

I had no idea where to ask about this but you guys know everything :-)

Try a local machine or welding shop. They usually have all types of
metal and a bin filled with small pieces left over from big jobs.