From Wayne Sayles' vcoins.com store: 
http://www.vcoins.com/ancient/sayles/store/dynamicIndex.asp
 

Alexandria, Egypt: Maximinus I / Roma

Billon tetradrachm, (year 1 = AD 235). 12.53gm, 24mm. Laureate 
bust of Maximinus right / Roma standing left. aVF with rough 
surfaces. Emmett 3294(1), Scarce.

Price 
US$ 75  euro 63.97
 £ 43.73
 AUD$ 101.97
 CHF 98.97
 CAD$ 87.69

Rates for 11/25/2005