Do a lot of cuttings or growing from seed? Buy a carton lot (1000) of Jiffy 7 pellets and get growing, economically.
These compressed Jiffy Pellets are designed to absorb seven times their weight in water. Once the pellets expand upward, they form their own container complete with peat growing compound.
There is no need to add soil. Large seeds can be placed 1/4" below the soil surface, and smaller seeds nearer to the top of the soil. Just keep the pellets moist to encourage the seeds to grow.