I previously did not know about this until today, and have only seen it in two places, with Amazon being the cheapest of the two. Also available on Wii U: https://www.amazon.co.uk/dp/B06X9M185P
From Amazon description:
"Includes 3 Expansion Packs
Expansion Pass Bonus (available at launch) - 3 Treasure Chests
DLC Pack 1 Summer 2017 - Adds New Cave of Trials challenge, New Hard Mode and Additional Map Feature
DLC Pack 2 Holiday 2017 - New Original Story, New Dungeon, Additional Challenges"