BTW: https://www.bricklink.com/v3/studio/design.page?idModel=1603... or other, similar models there.

Bricklink is perhaps secretly (or perhaps not) owned by LEGO itself so they can have their hand in the pocket of the used / resale market. People will upload full MOCs (My Own Creation) there and you can purchase the sets piece-wise. Usually even more expensive than if you wait and buy a set through LEGO but for stuff like this it's worth it.