https://www.reddit.com/r/GameDeals/comments...deluxe_edition/

Found it from above reddit link.
Here is the store link https://www.microsoft.com/de-CH/store/p/dea...on/9nblggh43706

I think the easiest way to buy it is by buying 15CHF credit from http://eu.gamemiles.com/124311 (need to use VPN like tunnelbear).
Redeem the game from the link, and find something else to spend the 5CHF balance.