I realized that some people sell them on Ebay, but where did they get that for free?

Couponmom.com

I buy coupons on Ebay too. I think I know where they get them. BUT from my experience, my Dad worked for the Chicago Sun Times. Pretty high ranking. At 16 I wanted a job. I got one all right. Being a 'stuffer' . When the papers came of the line we stuffed them with the circulars. Circulars are the coupons and what not. At the end of the morning...yes you did work weird hours as a stuffer..there would be all the circulars left over but the papers would be stuffed. So I guess, and I could be wrong, but I think they take the stuff home and cut them out and sell them. That's my theory. I base it on menial work as a stuffer.