I use a mix of sources. I generally get most music from emusic, but that's for mostly general
When it comes to Electronica and House/Deep House and others, I tend to use
Beatport, but more recently have loved the specialty and gems I've found on
Stompy.com and Juno.co.uk.
Discogs and Ebay for finding and replacing good old skool stuff, but have found it
much better to check out emusic first which I use much much more than itunes.
Discogs now in some areas now is doing downloads depending on the record label.
For example Henry St. Music (classic house) on discogs does digital downloads.
cheers for NYC.