Buy 1 get 1 Free coupons can save you a lot of money! These are one of my favorite coupons (well except for the free item ones )
Some stores allow you to use a B1G1 coupon with a B1G1 sale and you get both items for free! Here is an example, please know that there has NEVER been a B1G1 Wisk coupon I am using them as an example as to how a B1g1 coupon paired with a b1g1 Sale works.
When pairing a b1g1 coupon with a b1g1 sale you are getting both items for free but one is paid for by the store(because of their sale) and the other is paid for by the manufacturer by using the coupon.
Not all stores allow the use of B1G1 coupons with the B1g1 sale but watch for products to go on sale that you have b1g1 coupons for so you are paying the cheapest price you can for the one that you are buying.
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