I use at least a few cotton balls on my face every day. I always make sure to use organic cotton balls. I figure that if they are going to have that much contact with my skin I don't want to be rubbing lots of farm chemicals into my face.
The organic essential cotton ball brand is available at a lot of stores and it's not that expensive. There are others you can buy too. I may be overreacting but I take the skin on my face very seriously. I don't want to do anything that would encourage blemishes or mess up my tone.