The iTunes App Store offers downloads of several apps for Apple iPhone, iPod touch, or iPad which have dropped in price, as listed below. At up to $2 off, each is at the lowest price we've seen. The deals, all with applicable platforms noted:

• Desert Zombie Last Stand for iPhone, iPod touch, and iPad for 99 cents ($5 off): Third-person action game
• Convert for iPhone and iPod touch for 99 cents ($2 off): Unit translation tool
• The Monster at the End of This Book for iPhone, iPod touch, and iPad for 99 cents (pictured, $3 off): Grover-centered children's learning tool
• CoinKeeper for iPhone and iPod touch for 99 cents ($2 off): Expense tracking
• 8mm Vintage Camera for iPhone and iPod touch for 99 cents ($1 off): Retro video camera
• Dungeon Defense HD for iPhone, iPod touch, and iPad for $1.99 ($3 off): Tower defense game