Lola Rennt has an extensive collection of merchandise that you are able to buy.
Physical media
4K UHD
BluRay
DVD
German 2 x DVD
Soundtrack and singles
Compact Disc
Vinyl
I Believe
Wish (Komm Zu Mir)
Book
Screenplay
Posters
There are a multitude of online sellers for movie posters, originals or represses. Be careful on what you buy.