How much your barbies are worth today, depends wholly on what condition your barbies are in, and how old they are. Older, or rare barbies, would be worth quite a bit. Regular barbies are not worth more than retail value.
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How much your Barbie dolls are worth today will depend on their age and condition. The older Barbie's in the best condition are worth the most. Limited edition Barbies fetch more money than those that were mass produced.