You said you looked at Microsoft Official Courses On-Demand. Did you click on any of the courses? Look to the left of the list of courses; you can filter the list.
When I click on a course there is a "Community" node at the bottom; did you try any of those?
You said you looked at
Microsoft On Demand by LRS Education Services. Did you see the link for "See All Microsoft On Demand Courses"? When I click that I get a "REGISTER NOW" link for each course. That sure looks like the way to purchase the course.
Note that I am not Microsoft. If you must have a response form Microsoft then you probably must wait until Monday, or at least Sunday night since that is Monday morning in China.
Sam Hobbs
SimpleSamples.Info