woocs_price_html_tail

add_filter('woocs_price_html_tail', function($price_html)
{
    return $price_html . "<strong>Hello World!</strong>";
});

.woocs_price_html_tail{
    display: none;    
}

body.single-product .woocs_price_html_tail{
    display: block;
}

body.single-product .related .woocs_price_html_tail{
    display: none;
}