Select Widget - How to pass two values ?

Hey guys,
In a select widget you can set the displayed key (in my case: E-Book), returned key (in my case: 490$) and the value (in my case $item.price).

My problem is, that I need to fill two variable, because on the next page I want to see what the customer choosed and what the price is. For now, I only see the price.
How can I set the name of the product (->E-Book) and the price (->50$), by selecting "E-Book"?