v0.6.5: added a price to stones of augmentation

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/stones/StoneOfAugmentation.java

@@ -64,6 +64,11 @@ public class StoneOfAugmentation extends InventoryStone {
 		ScrollOfUpgrade.upgrade(curUser);
 	}
 	
+	@Override
+	public int price() {
+		return 30 * quantity;
+	}
+	
 	public class WndAugment extends Window {
 		
 		private static final int WIDTH			= 120;