RedLaser doesn’t just do the expected—allow you to type in a product name and find the best deal online or in a brick-and-mortar store. If a major retailer carries the item, you can buy it directly through RedLaser and arrange for in-store pickup. (Free, iOS or Android)
PriceGrabber offers a special feature called the “gift shaker.” When you need a gift, choose a category and price range. Each time you shake the phone, you’ll see a new suggestion. (Free, iOS or Android)
Decide displays “current prices and tells you whether those numbers are likely to drop within the next two weeks.” If it’s wrong, you’ll be reimbursed the difference. ($5 monthly, iOS)
Smoopa will give you cash or gift-card rewards if you ever find a price lower than the one the app cites. (Free, iOS or Android)
Source: Real Simple