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Vinyl records outsell CDs for the second year running
(www.theverge.com)
This is a most excellent place for technology news and articles.
Amazon does still sell digital music files, you just need to find the "digital music" section in Movies, Music and Games if that link doesn't work for you.
But you're right about google music, it got turned into youtube music and I'm pretty sure it doesn't allow purchasing and downloads. I'd imagine apple also still lets you buy music, but I've never actually used them before and don't plan to start now.