I bought a piece of C220 bronze sheet from McMaster Carr recently to make bits from. So far I've used some to make plates to support the becket on my centerboard uphaul, and the cover plate featured in my last post on the front thwart. McMaster advertised a 2" x 24" x 0.09" piece of bronze for US$41.27. Expensive, but them's the brakes. I ordered it, and it showed up a week or so later. The cost on my card: AU$106.72. So the shipping was just as expensive as the metal.
So I asked on the woodenboat forum if there were any alternatives to McMaster, and found online metals. They will cut sheets to fairly arbitrary sizes, and are at least upfront with shipping. I tried a 12x1x0.125" piece of 220 bronze. US$14 for the bronze, but a staggering US$123 for shipping. Just for fun, I tried a 1x1x0.125 piece: