Where can I buy pistachio paste online?

Quality pistachio paste is available from specialty baking suppliers. Nuts.com, Barry Callebaut, and Sicilian specialty importers sell pure pistachio paste (100% ground pistachios) with no additives. Amazon carries several brands including Settepani and various Italian imports. Look for paste with no added sugar or oil for the most versatile baking ingredient. Prices range from $15-$35 for 200-400g depending on quality and origin (Bronte pistachios from Sicily are premium).