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If you were holding off on buying a human skull off of eBay, you might have waited too long. After years of criticism, the online auction giant has officially announced a ban on the sale of human skulls.

According to Buzzfeed News, there were two dozen active human skull listings as recently as Thursday. Most were marketed as tools for medical study, but anyone could purchase one.

The average opening bid for a human skull was roughly $650, but one sold for as high as $5,500.