The Coupons is a simple but very useful Android app that lists the day’s promotional codes, free stuff, discounts, and online coupons for various merchants. Features include the ability to search coupons by title or barcode, submit coupons, and login to your account. If you own a business you can get your local deal listed in their database of discounts. Users can subscribe to the service as well as comment and rate the various deals and freebies in the list.
Useful features for Shopster:
-A user can send coupons to others so application can become popular very easy.
-Users can get coupons or search for coupons about something they probably want to buy.
source:https://market.android.com/details?id=thecouponsapp.coupon&feature=search_result