Food for thought...save at the grocery store

Maybe it's the economy or maybe it's my mindset for getting out of debt, but lately my writing has taken a turn toward money-saving ideas. Regardless of the reason, I'm enjoying the ride--and the learning. Some of the great tips that I've learned recently involve grocery shopping. My favorites are:

• Bring cash--Leave your checkbook, debit, and credit cards home, so you don't overspend. Bring $10 extra to stock up on extra-special deals.
• Shop quickly--Every minute over a half-hour spent in the store costs you 50 cents per minute.
• Investigate all food sources--Include grocery stores, warehouse clubs, salvage stores, food co-ops, farmer's markets, department stores, even your gas station. never assume one source has the lowest price on every item.
• Know where to look--Look high and low on the shelves for the best prices. check behind fronted shelf items for larger bonus sizes, and shop the perimeter of the store for basic, most-needed grocery items.
• And stock up--Buy pasta, canned foods and boxed goods on sale. They are items used regularly that have a long shelf life. Als0, look on the front and back covers of the sale fliers for sales that the store takes a loss on, literally and build your grocery list and menus around these items for the greatest savings potential.

What are some of your best grocery shopping, money saving tips?