Free Items

Hello,

There is a workaround for this
you can use a custom function (I personally located it in function.php of my theme).

For you, it could be something like that

function custom_ecommerce_price($formatted, $raw_price = '') {
    if ($formatted == '$0,00') {
        return "free";
    } else {
        return $formatted;
    }
}

add_filter('price_format', 'custom_ecommerce_price');