They used to do deals all the time, But the App store framework makes it hard... They usually do deals for certain days during the holidays and for new version upgrades.
But like Inverted said, LogTen is awesome and while they don't do phone support, they are usually very quick to email you back (within 24 hours) I started with it while instructing and just used the iPhone app once I got to the regionals. It was amazing to never have to worry about a little black flight log...