I've heard that mustard oil is NO JOKE!! You get it from the Indian/Pakistani markets. Most of these oils seems to work for growth:
Mustard
Alma
Olive Oil
Coconut
Shikakai (cleansing the scalp)
Aritha (cleansing and softening)
Mahabhringraj (one day I'll learn to spell this right)
Bhringraj
Keshvarhini (again, I'll learn to spell right someday)