The bug
After logging in to minecraft.net, the Realms tab under the My Account / Profile page, does not display realms price, and the purchase plan button leads to nowhere.
To reproduce
Log in to minecraft.net
Go to the profile page.
Press the Realms tab on the sidebar
Press "Buy a Realms subscription"
→ ❌ The pricing displayed on every Realms plan is None / month, or None. Pressing the Check Out button leads to a seemingly 404 page.
Service/Web self healed