In the age of apps (does anybody even remeber apps is short of applications?), there are a few that can save you money when you're shopping.
Coupon Sherpa will search for coupons online and send them directly to your smartphone for scanning at the checkout.
CardStar can store your retailer loyalty cards on your phone, so you won't have to dig in your purse or wallet to get the added benefits they bring.
There are may others, Do a little searching on the internet and see if you can one or more that are perfect for you.