Amazon offers Prime members the LeapFrog Creativity Camera App with Protective Case for iPhone and iPod touch in Pink for $5.51 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs around $6.) That's the lowest total price we could find by $11 and the best deal we've seen without rebate hassles. It turns your iPhone (4, 4s, and 5) or iPod touch (4th-generation) into a kid-friendly camera and includes a photo learning app with six learning modes.
Orders placed via 2-day shipping by December 22 will arrive in time for Christmas. (This option is free for Prime members but $11.83 for everyone else.)