Bargain hunting, while not always fun, can definitely pay off in the long run. The Red Laser barcode scanning application for iPhone is one way to make bargain hunting, not only pretty fun, but also ridiculously simple. Just line up the bar code in the finder window and it quickly scans it and then pops up a screen with local and internet prices for the same product! Within a few seconds you'll know whether you're getting a deal or whether or not it's worth it to do some more legwork. While not every barcode is in the database yet, this app is so easy and fun to use, you'll want to try everything, just for the heck of it.

Comments
You’re sleeping on Pricecheckah. It uses the great RedLaser barcode scanner, but gives you results from Amazon, eBay, walmart, overstock, buy.com as well as Google. It even let’s you put in your own stores.
And at only 99c.
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=300264101&mt=8