Extreme Coupon Tips

Did you know if you match buy 1 get 1 free sales with coupons, you can use a coupon for the free product too?

Did you know that you can use a store coupon and a manufacturers coupon for the same item?

Grocery stores promote "loss leaders" in their sales ads to get you into their store.  These are usually items discounted 40% to 70% off the retail price.  If you have a coupon for that item as well, you can save 75% to 100% off the price.  Free has a good ring to it, doesn't it? 

So Frugal Friends, do you have any extreme coupon tips?