Tiggerish, it's such a tough call! The grocery sales that start tomorrow are just loaded with stuff I use on a regular basis. And because I did no buy last month, my stockpile is dwindling. I'm not sure if no buy and couponing go together, but I do know that documenting what I buy for the no buy challenge keeps me honest about what I spend my money on.
Last month I spent $168 dollars less on groceries, toiletries and cleaning supplies than I did in April. If I am being honest, I think that was more due to aggressive couponing than no buy days, but for now I am sticking with both as a strategy to save.