There are also match-up websites like Hotcouponworld.com that will figure out the sales and coupons for the week.
You can also buy coupons from thecouponclippers.com and ebay.com. This is great if you don't get the Sunday paper, or just want to buy more than one of that particular deal.
I used to do this when there was a great deal on 7th Gen cleaning products or Eggos. I would get like 10 of the same coupon and stock up. I am not a hoarder or anything but I was really excited to get 7 bottles of dish soap for .50 a peice.