Can someone explain to me the rules of stacking? Like how do I know which coupons can go together? Can there be more than one of the same one? Or how about if you have, say, save $3 WUB 2 of this kind of shampoo, and then you also have $1 WUB 1 of this shampoo, could you stack those?
I stacked 4 today on a box of tampons (lol). Was $8.99, stacked 3x $1.00 + 1x 2.50, but they weren't the same coupons

