So, up until this year, Sunshine was only available on iTunes. But apparently, they re-issued it to some other platforms (including streaming, like Spotify) in May 2018.
So while you can now buy it on Google Play and Amazon Music, the really interesting one is the TIDAL store:
http://tidal.com/store/album/88890392
because they offer a lossless FLAC purchase option. This is the first time this has been available in lossless. I couldn't find it in any other lossless stores (like 7Digital or Qobuz), except for one or two stores in Japan.