Re: Saudi: Could you please advise how I can buy the original Smart Case for my AirPods Max?
If you don't receive the reply you are looking for  here in the (user-to-user) community.
You may need to check with Apple Support: 
You can get started on the AirPods Replacment webpage: See Apple Supports info. about Replacement : AirPods Replacement, Repair, and Service - Apple Support (SA)
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More support options if needed:
AirPods Support Website:
Find all the topics, resources, and contact options you need for your AirPods....
AirPods Support - Official Apple Support
or
If you  still need help: See if you can connect with live support in your country by phone
                                      Contact Apple Support - Apple Support (SA)