Just want to chime in to agree with Bandcoach and Fataltone. While some of these promotions MAY be real, you have to be VERY CAREFUL. If it IS real, it will probably be expensive. Any of those packages that are like $40 for 40,000 plays or something... just pass.
Those plays really mean nothing anyway. Just take a minute and actually imagine what your track will look like when it's over - it will say 40,000 plays perhaps, but there will not nothing to show for it. No sales. No increased buzz about you. No plays on other tracks from interested people. And when other people look at your profile, it will be obvious you paid for the plays, and DECREASE your credibility.
The temptation is strong, but skip it. You don't need it. Instead, follow a few people who create similar music to yourself and some of their fans every day.