From the Sphinx Numismatics vcoins store:
http://www.vcoins.com/ancient/sphinx/store/dynamicIndex.asp

                   
                  356FG) FAUSTINA SENIOR, WIFE OF ANTONINUS PIUS, AR DENARIUS, 
                  ROME AFTER 141 AD, 19.50 MM DIA, 3.50 GRAMS, BMC 360, RSC 6, 
                  RIC 348, IN XF CONDITION. EX CNG LOT 941, MAY 1997.

                    
                  356FG) FAUSTINA SENIOR, WIFE OF ANTONINUS PIUS, AR DENARIUS, 
                  ROME AFTER 141 AD, 19.50 MM DIA, 3.50 GRAMS, BMC 360, RSC 6, 
                  RIC 348, IN XF CONDITION. EX CNG LOT 941, MAY 1997.

                        Price 
                          US$ 155  € 127.69
                         £ 85.02
                         AUD$ 199.62
                         CHF 197.21
                         CAD$ 190.96

                        Rates for 6/20/2005