|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon UK||7 days ago||30.72||$21.96||You save $8.76|
|Amazon US||4 days ago||28.98||$21.96||You save $7.02|
David A. Wolff is associate professor of history at Black Hills State University in Spearfish, South Dakota, USA. He is an award-winning author focusing on Black Hills, South Dakota, mining, and western history.