Dave Krall asked where he could buy 1/8" X 7/16" and 1/8" X 1/2"
flat cold-rolled steel with rounded edges.  I'm not sure he can get
cold-rolled with rounded edges these days.  I think small sizes of
cold-rolled tend to be sheared from sheets today, and are likely to
have a squarish edge.

I have purchased steel, and other metals, from Enco.  See cold-rolled
strip on  http://www.use-enco.com/CGI/INPDFF?PMPAGE=800&PARTPG=INLMK32 

Without knowing the exact needs I might be inclined to use hot-roll
steel from Lowes or Home Depot which I can get locally.  It has rounded
edges.  Of course it also has mill scale, but that can be sanded or
sand-blasted off.

Wallace Venable