These companies charge an upfront fee but 100% of the money the filmmaker makes goes to the filmmaker.
TuneCore: Upfront cost: $999 (SD) $1249 (HD). TuneCore started off helping musicians get access to larger retail platforms but has now branched out to help filmmakers as well.
Spend some time and research these companies to see which one might be right for you. There are differences between them. For example, TuneCore seems to have access to more regional iTunes stores while Distribber has access to US and Canada only. However, Distribber has access to more retail platforms than TuneCore does. So spend some time and research the differences and see which one is a better choice for you and your project.