How knitting cut my grocery bill

This one little tool: A hand-held row counter. (Mine is this one by Clover.) In knitting, you click it at the end of every row, and it helps you keeps track of your work so you stay on pattern. But after buying it, I realized it was just what I needed for grocery shopping! I keep it in my pocket and when I toss an item in my basket, I round the price up to the nearest dollar and click my counter.