I'm pretty sure all music on www.bandcamp.com comes in FLAC and ALAC for no extra charge. It's mostly independent artists but there are a few major names (e.g.

I'm pretty sure all music on www.bandcamp.com comes in FLAC and ALAC for no extra charge. It's mostly independent artists but there are a few major names (e.g. Sufjan Stevens). www.beatport.com also offers high quality audio for a little extra (not sure on the format or extra charge though).