If everyone did this we'd save trillions in higher taxes.
Full Disclosure: comparison shop on sales within a store. Most items will have a unit cost on the shelf price; compare those before buying whatever has a "sale" sign on it. Also, a solar-powered calculator can help you determine unit costs for items which are priced deliberately confusing such as paper towels or T.P.
Set aside one day of the week to go shopping (mine is Saturday early in the morning). Go through the newspaper and bulk mail circulars for the two or three closest stores to you, comparing to your list. By making one or two stops you can save ten or twenty dollars per shopping trip by cherry picking from each store.
Buy in bulk, cook in bulk. Make meals for a whole week and store them in the fridge. Take the leftovers to work for lunch -- it saves a lot of money compared to buying a sandwich at noon. And if your office does not have free coffee or tea, bring your own instant coffee and/or teabags from home. Why pay a dollar for something that costs a dime if you supply it yourself?
If it is hot outside and you are worried the food won't keep, put an ice chest in the back seat with ice or blue ice in it to store the perishables. I have done this in Phoenix in mid-summer at 110 degrees.
Cheers!
“And if your office does not have free coffee or tea, bring your own instant coffee and/or teabags from home. Why pay a dollar for something that costs a dime if you supply it yourself?”
Better still, become the coffee club coordinator and price a monthly membership that exempts your own consumption. Heck, you might even be able to add a little bit of income out of the deal!
;-)