Check out Small Parts in Miami. They supply everyone from
hobbyists to the aerospace and medical industries. You will find
miniature screws, bearings, all sorts of stuff, including sheet and
wire in many different metals. I get a stainless wire from them to
use for pin stems. It comes straight and polished, and is soft enough
to thread without annealing. http://www.smallparts.com/
35 N. Market St.
Frederick, MD 21701