According to a new study by Chadick Martin Bailey and iModerate Research Technolgies almost half of smartphone users have used apps like ShopSavvy. Here is a quote about the poll from internet retailer:

A poll of 1,491 U.S. adults finds of those who have used a smartphone app or mobile browser while shopping, 44% have used a bar code scanning app such as RedLaser or ShopSavvy that lets them compare prices and learn more about products and services in stores. 38% have used a discount or deal app such as those from Groupon or LivingSocial that offer deep discounts, typically on local goods.