I posted before about the awesome program TuneCore. You can read that review HERE.
"Pre-buy. Save money. We’re ready when you are."
Distribution credits provide a way for you to pre-buy music distribution at a discount of up to 20% even before your music is ready. When you’re ready to distribute your album, single or ringtone, your distribution credits will automatically be used. Sounds like a great deal! They help you get your music on iTunes, YouTube and more! It's like buying in bulk, but with credits to help you pay for and get your music out! And, it makes online music distribution even faster and easier.