I have a huge purse and one pocket is only for coupons. It helps to have the majority of your coupons with you at all times. I can always find a clearance and store sometimes offer unadvertised sales. Stores like Rite aid offer monthly rebates. Now, you can even rebate online and save the cost of a stamp and envelope.
Rite aid is great.
Not only do the offer tons of items free a month, they accept coupons. Sometimes I get paid to buy an item. The down side, you have to have the money up front. But in the end it really pays off. I hardly ever buy shampoo, soap or luxury items.