Shadowlands Epic Edition No Longer Available?

I’m not able to find a way to upgrade to the Epic Edition of Shadowlands on the shop. I had planned on upgrading my version before the end of the expansion, and I didn’t see any announcements about the Epic version no longer being available after a certain date (as there were with the TBC Classic Epic Edition). Am I looking in the wrong spot on the shop, or is this some sort of bug, or did Blizzard intentionally end access to the SL epic edition with no notice?