Where do you buy your CDs these days?

Epilog: Today most CDs are mastered way to LOUD. You can find the problem described if you search for LOUDNESSWAR on youtube.
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Because of the LOUDNESSWAR, I do not buy new CDs ever.
LPs can NOT be LOUDNESSWAR mastered, so new albums sound way better on LP.
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DISCOCGS is always my go-to-site for CDs or LPs in physical form.
It is superb sorted and I can search for CDs with proper mastering printed before 1990.
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The proper thing to do than, would be to rip them with EAC (Exact Audio Copy) on a PC which makes sure by comparing the signatures with its database that everything is ripped bitperfect.
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After that I convert the FLAC to iTunes lossless ADAC with XLD.
.. to feed my non-oversampling DAC (Metrum Amethyst) and tube amp.
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best regards form Austria (Europe, not the kangaroos)

I buy new classical CD's and SACD's from PrestoClassical in the UK.  However, their shipping prices have just increased a lot, so Amazon Prime may become my source.

+1 Discogs.  I also use dr-wars.com First for checking the quality of the recordings before I buy anything,  very helpful.  and I then I can use Amazon Prime if cost is competitive. I’ve found some “jewels “ from them. And eBay too...
Cheers

Import cds.
Great selection, prices and service.

Amazon & Smithsonian. Used on eBay. Used Oldies in the past but service and quality can be sketchy so no more. Locally Goodwill and a few reseller's work if you can examine the product before buying.
Nice not to be tied to your ISP or streaming service for your music.
Then there is always NPR - if you still have a tuner.