Hi LIUFAN1,
Thank you for reaching out to Microsoft Community.
By the way, I edited your post to remove the Serial Number but I was able to check it here on our end and it shows that your Surface Book was over 3 years. That is why the support can only offer you with the Out-of-Warranty option for 930.00AUD. If you wish to proceed with that offer, I suggest that you contact support again so we could assist you in creating the order.
If this answer your question, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Kind Regards,
Marrion Y.