David,
Please do not let pbcaster's post throw you off. It's true that in a lot of areas wheelweights are no longer free, but not all.
It's true that there are zinc wheel weights, but there are also still lead alloy ones to be found. Also the zinc ones melt at a much higher temp so they are easy to sort out when you melt them. It's false that they will ruin a casting pot and mould.
The best advise is to go the the CastBoolits site. There you will learn far more than any book, the data is cutting edge for every aspect of casting. We have killed many sacred cows there.
Welcome to casting! I love it.
Cat
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Think for yourself.
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