Do I display the old (bigger) price along with the new (lower) price in the cart?

I display the old price (crossed out) and then the new price in the product page, but I am wondering if I should do the same in the cart and in the summary on the checkout page or just show the final price everywhere after the product page.

I might mention that it all happens in a desktop application which delivers game products, not a web e-commerce site, if it makes any difference. (a little less space, but than again shipping information do not apply, so I have a little more space in turn, if the amount of space even matters here).

Thanks!