I have been couponing fairly seriously for a year now. I'm looking to reduce my cost on paper goods like paper towels and toilet paper. How do people get such good deals on these items? I can never seem to save more than possibly a dollar and the coupons for these items are usually never more than .25 or .50 cents. What are your "stock up" prices for paper goods, and do you have any tips for how to save a lot on these kinds of items?