3Ply Disposable Protective Medical Surgical Face Mask 3 Ply Non Woven Face Mask

I need a disposable 3-ply mask. Here are my requirements :
- boxed by 50 pieces
- earloop
- good quality
This would be my first time engaging in selling disposable maskS. I'm starting with 500,000 pieces but for future reference, I would like to know how many units is needed to order for me to get a cost of USD$0.01-0.02 per piece.
Thank you very much.