I use a pricesheet created in Microsoft Word to track best prices as well. I have a MONTH column so I can keep track of which month I got my best prices on each item. That way, if I'm running low on something and I see I got my best price during the upcoming month, I'll wait until then to purchase in bulk for the upcoming year. My friends are amazed at how little I spend to feed my family. About $160/mo for family of four.
