This is the best woot application I have come across and it is fairly new in the app store. Just to be clear, I have no ties to this app at all. I just thought I would pass along a woot app with a great UI and push notifications that is free
http://itunes.apple.com/us/app/iwoot/id412741665?mt=8
http://itunes.apple.com/us/app/iwoot/id412741665?mt=8