MP3Million has an excellent MP3 catalog, many payment options, a help forum, and prices at $0.15 per track with an additional 20% discount for entire album purchases. Most albums have cover art, and all tracks are encoded at high bitrates. Very high payment bonuses (a $50 payment will land you a $50 bonus, for a total of $100 worth of track downloads) and easy downloading might make this the right site for you.
