well see, here our stores have never doubled or tripled coupons. Never given overages. You can only use 1 store and 1 manufacturer coupon per product (unless it specifically states it can be used for more than 1 item). It's just not possible at our stores here to get that great of a deal on stuff. So seeing these kinds of shows and hearing about this kind of couponing is completely foreign and crazy to me.
Just about every store around here doubles in some manner. Some will double only up to a value of $1, so that a 55-cent coupon gets 45-cents added to it while a 30-cent coupon gets another 20-cents added to it.
Another store "fully doubles" any coupon with a value up to 99 cents. So a 75-cent coupon gets another 75 cents taken off. A 99-cent coupon doubles to $1.98 off.
One store near me gives overage but most do not. I had $1 Tic Tac coupons the other day and since the store charges 99 cents for Tic Tacs, the front end manager had to come over and adjust each one down by a penny.
I don't know of any stores that will permit you to use two cents-off coupons on the same item. But sometimes you can use a Buy-1-Get-1-Free coupon with a cents-off coupon. It really depends on how the coupon is coded.
But let me tell you, my greatest savings is not because I get overage or from doubling. The real savings is from matching the coupons to the sales and taking advantage of Catalina offers when they are available.
I went shopping for our Father's Day BBQ yesterday. Bought 2 pounds of Italian sausage, peppers, onions, 3 racks of ribs, 2 pork tenderloins, 3 cans of baked beans, blueberries, tabasco sauce, cabbage, cole slaw dressing, lettuce, corn on the cob, tomatoes, and 2 pineapples. Using coupons and Catalinas, I paid over $40 for everything. Every single item was on sale. The ribs alone would have been more than $60 before the sale price and Catalina. So there's an example of real-life extreme couponing. I got $140.17 worth of groceries for $40.06 - a 70% savings.