Hello all,
What is your shop set up for? Rolling mill? Hammer and anvil? What size material do you need?
If you are looking for silicon bronze sheet and rod, I have found Atlas Metals in Denver to be quite good, but they sell 2' x 10' sheets and 6 or 12 foot rods.
Mcmaster in Chicago has a great online sales site with Silicon Bronze rod 5/16" on up, but no sheet. lots of other copper alloy sheet goods though.
For joining bronzes and a good color match, remember to use the same alloy, I always use 655 silicon bronze so my castings match my forgings and my raised or formed sheet, then my scrap can be used for casting.
Kind regards