Hair extension manufacturer?

Hi everyone!
I am sort of new to this lol.. I am a salon owner and hair extension technician. I am now expanding my business and I will be selling hair extensions. I am looking for a manufacturer or wholesaler supplier that supplies Russian remy hair, Indian remy that is grade 4A and above! If anyone can point me in the right direction that would be much appreciated, there isn't much on Google.
Thank you in advance!