I believe this is the cheapest it has ever been. Guess they're wanting to drum up excitement for the new Shadowkeep expansion. From what I've read, that expansion will not include this content, however. I'm sure there will be some kind of bundle that does, eventually, but the expansion itself will not include this stuff.
The new Menagerie thing looks pretty cool.
Seems to be a little cheaper on PS4 and a little more expensive on Xbox, but all within a dollar.