MP3s are not sold encrypted. Somehow, it hasn't killed the music industry. So there is no lock in on where you buy your MP3s from. My most recent purchase was from 7 Digital, a British company that specializes in providing white label music store services online. However, anybody can buy direct from them, and a quick check of the last six albums I bought shows that price is not an issue. The prices ranged from $1 less to $1 more, so averaging out the same as what I would have spent at Amazon. However, 7 Digital provides downloads at 320 kbps, which is technically a slightly better quality than Amazon. For a couple of bucks more you can download lossless file formats.
I did have to assure American Express (via text message) that it was indeed me buying a Bruce Dickinson album with my AMX card. I guess it was the foreign company thing that flagged the fraud alert. It certainly wasn't the music selection.
I don't see any reason that I'll need to buy music from Amazon in the future as 7 Digital is a perfectly viable alternative.
This is entry #26 in my attempt at 31 days of blogging for December 2018. I've haven't posted here daily since about 2007, so this should be interesting.