I am currently trying to display the original price of each product (that was added to cart) on the cart page. Everything works like a charm, unfortunately only one last thing is bothering me. Normally all prices 'refresh' as soon as you change the quantity of a product. When this happens the value of every compare_at_price will be set to lowest 'compare_at_price'-value (the 'compare_at_price_min') of the current cart items. That's because 'compare_at_price' will always get the lowest value. Before changing the quanitity every value is assigned correctly.