Best Shopping Apps

[applelove32]

I am college student and I am always looking for the best deals. I want to load my iPhone 4 with the best shopping apps so I can always be aware of the best deals around and save money? What are some good apps for this? I like Groupon - but sometimes the items on promotion are large-ticket items. I am looking for apps that will give me discounts on things like groceries and other things that are needed on an everyday basis.

I found these blog posts that lists the best shopping apps.... but I am sure there are even better ones out there...

Best Shopping Apps for Any Shop-O-Holic

what do you guys think? does anyone use Red Laser? I think it could be a great shopping tool!