Groupon While the website never really appealed to me, Groupon's apps and the Groupon Now service is ridonculous. I could pass by a store or bar or whatever and get notified if there is a sale going on at that particular moment. Pretty sweet.

Amazon Mobile If I could only have one shopping app to choose from, this would be the one.

Catalogue by TheFind - the award winning catalog shopping app The days of spreading newspaper circulars all over the kitchen table are over. This app aggregates deals and coupons from all the major retailers.

Watch with eBay This one is pure genius. Sit on the coach, load your cable/satellite information into the app, let it know what channel you are watching, and get presented with related merchandise you can buy with a tap of the finger.

Yowza!! Mobile Coupons A pioneering mobile coupon app that remains relevant nearly four years after it debuted.