My store fo choice: Qobuz

My store of choice:

Streaming and music Downloads in 24-Bit Hi-Res - Qobuz

qobuz.com

https://www.qobuz.com/gb-en/shop

Bandcamp

Bandcamp

bandcamp.com

https://bandcamp.com/

Bought the entire Carbon Based Lifeforms discography there.

HDTracks

HDtracks

hdtracks.com

https://www.hdtracks.com/

US.
Quite expensive.
Lacks selection outside of the US.

Bleep

Bleep - Your Source for Independent and Innovative Music - Buy Vinyl and CD, Download MP3, WAV/FLAC, 24bit WAV and Buy Merchandise

bleep.com

https://bleep.com/

7Digital

UK Store:

7digital United Kingdom | High-quality Digital Music Downloads

7digital.com

https://uk.7digital.com/

Test with Mirwais: no FLAC download. Only MP3 & M4A @ 320kbps.