Putting myself in temptation's way

I did a very stupid thing. One of the ladies here at work sells small chocolate bars at her desk for a dollar, as a fundraiser for something or other. I am usually pretty good at limiting myself to one a week maximum of these. But, I was in the local supermarket the other day and they had packets of mini Snickers bars on sale. So, I thought, oh if I buy that I can have it in my drawer for when I just want a little tiny little bit of chocolate, and that will prevent me buying one from the fund-raising box when I NEED chocolate, and it will be cheaper. You can imagine how that turned out ...