I mostly use eBay past history and CardTarget, but Google is also very good for finding prices at various auction houses that may be missed or not covered by CardTarget and fall outside the three month eBay window. That is especially helpful when you are dealing with something like postcards that are rare and don't come up for auction very often.
Last edited by Bored5000; 04-02-2013 at 05:30 AM.
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