The iTunes App Store offers downloads of several apps for Apple iPhone, iPod touch, or iPad for free, as listed below. At $1 to $4 off, each is at the lowest price we've seen. The deals, all with applicable platforms noted:

• Zen Pinball for iPhone / iPod / iPad (pictured): Pinball game
• Radballs for iPhone / iPod / iPad: Match-three game
• I Can Do It 2011 Calendar for iPhone / iPod: Daily affirmation app
• Tapfolio for Stocks iPhone / iPod: Stock tracking app