Using the WooCommerce « Products » module you can display your « on sale » products in a page like this. In this example we will use the list option instead of the carousel one.
Use shortcode: [[products on_sale= »true » limit= »3″ columns= »3″ category= »home »]]
[products on_sale= »true » limit= »3″ columns= »3″ category= »home »]