So that you can filter products by price discount in a list, you can use this filter. We filter for at least 40% off in this example.

Also, we only use this filter on the post with ID 6127. For all other contributions, this list is not filtered.

	
function atkp_modify_products_callback( $products ) {	
	
	if(get_the_ID() == 6127) {
		$products_filtered = array();
		
		foreach($products as $product) {
			if(floatval($product->percentagesaved) > 40) {
				$products_filtered[] = $product;
			}
		}
		
		return $products_filtered ;
	}	

	return $products ;
}
add_filter( 'atkp_modify_products', 'atkp_modify_products_callback', 10);

Just add this snippet to your functions.php or to a snippets plugin. But be sure to adjust the Post ID 6127.