var INFLATION = 1.05;
var stockItems = api.GetStockItems();

var inflatedStockItems = [];
for(stockItem in StockItems) {
   var inflatedStockItem = dojo.clone(stockItem);                 // http://dojotoolkit.org/api/1.5/dojo.clone
   inflatedStockItem.price = inflatedStockItem.price * INFLATION;  
   inflatedStockItems.push(inflatedStockItem);
}