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 or near the lowest price we've seen. The deals, all with applicable platforms noted:

• Lumiè for iPhone and iPod touch for 99 cents ($1 off): Photo filter
• League of Evil for iPhone, iPod touch, and iPad for 99 cents ($1 off): Platforming game
• Star Walk for iPhone and iPod touch for 99 cents ($2 off): Astronomy guide
• Instacast for iPhone or iPod touch for 99 cents ($1 off): Cloud-based podcast streaming
• WORMS for iPhone and iPod touch for 99 cents (pictured, $2 off): Turn-based combat
• Batman Arkham City Lockdown for iPhone, iPod touch, and iPad for $2.99 ($3 off): Action-adventure game