I want to show both `special` & `regular` price at the same time on the product listing and product page for configurable products.

Right now it only shows the final price. E.g. if the regular price is **$50** and the special price is **$40**. I will only see **40$**.

What I want is that a strike-through the version of the regular price also.

The simple products attached to the configurable products all have a regular & special price set - even if all regular/special prices are the same, only the final price is shown.

Simple products show both special & regular price at the same time. Both prices are also shown if a specific option of the configurable product is selected. But I want it to be shown initially when no option is selected as well.