Google Shopper is a handy price comparison service that lets you quickly look up the price of an item in various stores to find the cheapest option. However, what's clever about Google Shopper is that it lets you search for product in a couple of unique ways.
Along with the usual barcode scanning and free text search, you can search just by taking a picture of the product or by simply speaking the product's name into your phone. Interestingly the app can even provide you with a map to the nearest shop that's selling the item at the cheapest price, provided of course, that it has a bricks and mortar equivalent.
The neat search tools and pretty broad range of online retailers covered make Google Shopper a good bet if you're trying to find the lowest price for an item you're planning on buying.