Alongside an upgraded version of its shopping app for the iPhone and iPod Touch platform and an enhanced mobile website, eBay today introduced a free new app into Apple’s App Store called Deals, which provides a constant stream of deals from across the hundreds of millions of eBay listings. It features simple navigation, customizable search features and even PayPal integration, which basically takes away any excuses for you not to purchase another pair of “authentic” Gucci sunglasses.

This release comes with news from eBay that mobile purchases through its site are growing in the double digits every month. This has resulted in a rate of one mobile purchase every two seconds. The company has also stated that it expects mobile sales to top $500 million by the end of 2009

The app is increasing eBay’s social media presence by allowing shoppers to share their buying activity and get opinions about their purchases from friends on Facebook and Twitter.

One of the biggest impacts I could see this having, especially during the busy and high expediture holiday season, is saavy shoppers using it to find bargains online while they shop in stores. Instead of outright buying a product they like, they can search for that product right in the store on eBay using Deals to find it at a better price.