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 $4 off, each is at the lowest price we've seen. The deals, all with applicable platforms noted:

• Gobliins 2 for iPhone and iPod touch for 99 cents ($2 off): Puzzle game
• Dinosaur Zoo for iPhone, iPod touch, and iPad for 99 cents (pictured, $3 off): Dinosaur reference tool
• GRave Defense HD for iPhone, iPod touch, and iPad for 99 cents ($2 off): Tower defense game
• Terra Noctis for iPhone, iPod touch, and iPad for 99 cents ($2 off): Platforming game
• Weather+ for iPhone, iPod touch, and iPad for 99 cents ($1 off): Weather tracking tool