Stick to a budget.<br />
Only buy what you need.<br />
Buy off brand to save money<br />
cut coupons<br />
Start an argument with the cashier so you can get the manager involve and get free stuff.
Notice the cameras. Wear a jacket. Peel off barcodes while looking like you're examining the nutrition facts. Stuff **** in your pants. Walk out the door...
Hire somebody to carry your bags! Makes the whole shopping experience a lot more enjoyable.
Don't just buy stuff that's cheaper, check that it's not a smaller quantity, or lower quality.
Use a shopping cart. Preferably, one without a thumping, squeaky wheel.
Buy online as sometimes the delivery cost is cheaper than fuel/parking costs