Override the plugin class and function

thanks… I dont know if is this good way, but this code in the child theme functions.php is working for me:

add_filter('woocommerce_product_class', 'myFunction', 10, 4);
function myFunction($classname, $product_type, $post_type, $product_id) {
    $classname="SUB_WC_Product_my";
    return $classname;
}

class SUB_WC_Product_my extends SUB_WC_Product {
    public function get_product_price( $context="view" ) {
        return "AB";
    }
}