Otherwise, if there's a Metal Supermarkets branch near you. Comparatively expensive, but very useful. I've got all sort of metal sections and sheet for my garden railway activities from the Southampton branch, when I worked in that 'orrible city. Beware of saying "Oh, I'll take all of that length of 50mm bronze bar, then" unless you are a) sitting down, and b) feeling financially flush. They used to cut bits of brass or ali sheet for me, to precise sizes, with a big scary guillotine.
