One Kiss - Calvin Harris / Dua Lipa, where to buy?

So, here's my story, I was messing around with a new laptop installing Linux Mint on it in place of the ghastly Windows 10 Home. I needed to test hardware playback of 1080 @ 30 fps video, from sits like YouTube. I browse to the main page, and a video keeps appearing in the top picks.
It's the music video for the Dua Lipa / Calvin Harris tune "One Kiss".
It seems a good candidate to test my hardware, and I can listen for a glitch in audio playback.

Anyway, after playing this a few times over, I'm kind of hooked. I occasionally hear it on the radio and I am digging it. The main comment seems to be "the song of (UK) summer 2018", yeah, I can kinda agree with that.

So, where do I buy a CD single or album or a lossless download hi-res of 16/44.1?
I don't want an mp3, and feel cheated paying for a 'damaged' format.
I think I would be dreaming expecting this to have a loudness range greater than about 4 LU and any kind of crest factor, but I could be wrong.

On CalvinHarris's site, there is a 12" vinyl for sale, but that's not my thing I. I'd like a decent digital release.

Thanks.