Some examples are:
Tearpad coupons ~ Stores display these often near products
Samples through mail or in person often come w/ a coupon
Printable Coupons ~ Coupons you can print at home
Peelie coupons ~ coupon found on the package.
What did that last one get you wondering?? Yes, you can contact your favorite companies and tell them of your favorite products and in return they will usually send you some coupons. They want your business.
In the pic bellow is coupons i received in my mail this week. I contacted these companies between 7-12 days ago. They were fast to send me coupons. Companies would rather here a nice compliment than a complaint.