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I bought a muffin pan from the dollar store a couple of years ago and tried to use it for an ingot mold. The cups did have a shiny plating on the surfaces; don't know if it was tin or zinc or chrome. The lead stuck tight to the plating and I had to beat the pan apart with a hammer and pliers to get the ingots out.

Stainless steel condiment cups, 2.5 ounce from Walmart or the more expensive 3 ounce ones from Sam's Club, make wonderful ingot molds. Just don't tip them over, or sit them on a surface that can't take high heat (don't ask me how I know this) I have cast close to a thousand ingots using them.

You can also cut the tops off of beer or soda cans and use them as single-use ingot molds. Filled to the top they'll weigh 8.5 pounds. You have to peel the can off, but that's not hard to do.