Save Big on Your Grocery Shopping

New online tool saves both time and money when comparison shopping.
2:14 | 07/22/13

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Transcript for Save Big on Your Grocery Shopping
shopping. Becky worley, new online tool that turns your computer into a supermarket aisle to make comparison shopping a snap. Take a look. Reporter: If you run out of stuff, oatmeal, pancake mix. That's the last garbage bag. And we always need more tp. So you look for sales. Clip coupons and then go where the prices are lowest, pharmacy, grocery store. Oh, this can take all day. But now a new service called mysupermarket.Com wants to try and condense that process. You know travel sites that compare all the airfares and then let you choose the cheapest. Well, that's what mysuper market is trying to do but for groceries. It compares prices from eight leading stores and lists them cheapest to most expensive. But shipping toilet paper and paper towels right to my front door, can that really make sense? I find a lot of the items I need not all but a good selection of brand names, 20 minutes of my time to buy 12 items, so now it's off to my local supermarket, the big box store, but the problem here -- crest, sensodyne. They don't have my brand of toothpaste so I have to get it someplace else. A few more stops for the items I'm picky about, four stores, three hours and 31 miles of driving. Clearly the online option is more convenient. But let's get down to the benjamin. The 12 items purchased from my local stores comes in at 141.62 including tax. But not including the value of my time or gas. But my supermarket.Com totals up at $139.45. Two bucks cheaper and that does include tax and shipping. It did take two to seven days for all those orders to arrive and when you run out of tp, that local option cannot be beat for immediacy. For "good morning america," becky worley, abc news, oakland, california.

This transcript has been automatically generated and may not be 100% accurate.

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