Below are downloads of several apps which have dropped in price and are available for a limited time from Apple's App Store. These apps are created for the iPhone and iPod touch; they're also compatible with the iPad but may run at a significantly lower resolution. (Check the individual apps for further information.) Each is a savings of $1 to $3 and the lowest total price we've seen. The deals:

• Castles Conqueror for free ($2 off): Strategy game
• Flying Defense for free ($2 off): Tower defense game
• Boxhead - The Zombie Wars for free ($3 off): Action shooter game
• Always UP! HD for iPhone or iPad (pictured) for $1.99 ($1 off): Puzzle game