Excellent Question! To answer this question, we need to clarify exactly what kind of RFID tags you are referring to. Since this website is focused on EPC adoption, we suggest several resources:
An in-depth article that explains the cost of a EPCglobal Gen 2 Smart-Label:
http://rfidwizards.com/index.php?option=com_content&task=view&id=343&Itemid=395EPCglobal Gen 2 product listings with some reviews and street prices for
Smart Labels:
http://rfidwizards.com/rfidtagsDurable Asset Tags:
http://rfidwizards.com/index.php?page=shop.browse&category_id=3&option=com_virtuemart&Itemid=561Hopefully, these can give you the answers your looking for. If not, please let us know if there are additional questions we can answer.