A few weeks back Amazon launched a price comparison app, and today they’re making sure you hear about it.

Amazon will be running a little promotion on Saturday. If you use the app to check a price and then buy the item, Amazon will knock 5% (up to $5) off the price. You can do this up to 3 times, but the offer is only good on Saturday.

Amazon’s price check app lets shoppers check a price by scanning a bar code, taking a picture of an item, typing in a text search. Amazon also enables consumers to submit the prices of items from the app so Amazon knows if it is still offering the best prices. You can find the app in iTunes, the Android Market, and the Amazon Appstore.

“We scour online and in-store advertisements from other retailers, every day, year-round,” said Sam Hall, director of Amazon Mobile. “Now, we are enabling customers to use the Price Check app to share in-store prices while they search for the best deals.”

I just might take them up on this, but I don’t plan to leave my computer. The app will work just fine at home, so I plan to take the opportunity to buy some more office supplies. I know that’s not what Amazon intended, but it works for me and they’re still getting my money so I don’t think they’ll care much.

Are you planning to use this offer?

Amazon