I googled for FLAC combined with a couple of different artists I listen to. Every single hit on the first page was a bittorrent site. I added "-torrent" and got a bunch of non-bittorrent file-sharing sites. :(
FLAC is the defacto lossless standard everywhere but iTunes. Boomkat, Bleep etc sell FLAC files. It also works in music software like Traktor, Ableton Live and Renoise.
FLAC is honestly one of the happier OSS success stories.