Hello,
By default, the price is displayed only if there is any option available for the current product. In order to circumvent this default behavior, you will need to change the code of the 
ShopiingCartItemSelector control that you can find in 
~\CMSModules\Ecommerce\Controls\ProductOptions\ShoppingCartItemSelector.ascx.cs. The only thing you need to change is the following condition in the 
Page_PreRender method:
ORIGINAL CONDITION:
if ((this.ShowTotalPrice) && (OptionCategoryInfoProvider.GetSKUOptionsCount(this.SKUID) > 0))
NEW CONDITION: 
if ((this.ShowTotalPrice))
It is also necessary to set the 
ShowTotalPrice property of the 
CartItemSelector control to 
true:
<uc1:CartItemSelector runat="server" ShowTotalPrice="true"  ...Best regards,
Michal Legen