At present, Huawei mate x3 has not been launched, so it cannot be purchased at the official price.
However, according to Huawei's experience in launching new products in previous years, it generally opens the reservation channel or publishes the purchase information on the official website.
You can log in to Huawei's official website to make a purchase or reservation.
You are advised to follow Huawei's official announcement to obtain the latest news.