I too keep prices in my head. When you buy certain things over and over again, you just know. For example, diapers. After having 4 kids the price of diapers has just stuck. LOL Anyway, I am one that has a limited space for stockpile items. So what I have done is focus purely on the items that I use the most. We are big tea drinkers so I keep a good stash of it, or try to anyway. Noodles is another items that is a good stockpile item for us. So many meals can be made with noodles. I no longer keep alot of condiments anymore with the exception of ketchup. I have learned that we typically use about 2 small bottles of mustard per year so why keep 10? Cereal is another good one, we don't eat cereal enough to keep 50 boxes. I have space allotted for 10 and that's my limit which works well. I do however try to keep as much HBA as I can. With 5 girls in the house, we go through a lot and 2 of them are about to hit the teenage years. Our needs are about to start changing and the stockpile will need adjusting. My biggest advise would be to focus on the needs of your family first. Then branch outward. Good Luck.