Just back from visiting this top site. In April 2014 a revised tariff for entrance fees to archaeological and other tourists sites in Iran was introduced and is approximately five time the price for locals. However, even at the new prices the costs are low. They range from 100,000 to 150,000 Rials which equates to between NZ$3.50 and NZ$5 (US$3 - $4.50).
Something is not right. This message is just to keep things from messing up down the road