I've never dealt with them, but www. alchemycastings.com seems to be doing this, if not on a larger scale. Their site should give you an idea of pricing, and where you can buy tin if you want to add it. They sell different bullet alloys and have all the shipping costs on line.
p.s. I intentionally broke the link as I’m not sure if this competes with any of the dealers above selling reloading supplies, better safe than sorry.
p.s. I intentionally broke the link as I’m not sure if this competes with any of the dealers above selling reloading supplies, better safe than sorry.