How can I swap the sale and compare at prices?

By default, Also Bought displays the compare at price after the sale price when a product is on sale and the app is configured to display both prices.

This also applies to the bundle total amount as we can see in the screenshot below.

However, some themes swap the compare at and sale prices so that the compare at price is displayed first.

Also Bought automatically configures the order of prices for all free themes and some paid themes but you can always change the default preset at any time from the app preferences page if for whatever reason prices are displayed in a different order. 

In the Prices section, inside the Visual preferences and change the preference Order of prices to match your theme behavior:

In the screenshot below we can see the Also Bought widget with the sale price and compare at price swapped, that is, the compare at price is displayed first.