Ikelite AF35 Flash.  Ikelite Underwater Housing for Nikon Coolpix L22.  Nikon Coolpix L22 12 MP Camera.  Mounting tray / handle. 16 GB Memory Card.

Everything you need to start taking beautiful underwater photos right now.  The AF 35 flash unit alone goes for $400+ all over Ebay and other sites.  The housing is listed for $180 on another listing.  The camera can be had for between $30 -$75.  For $400, you get the camera, housing, and single grip mounting tray and a 16GB memory card.  I have taken many awesome pictures with this set up and find it simple to use.

Ikelite AutoFlash Strobe AF35 kit
Part 4035
The Ikelite AutoFlash AF35 kit is an effortless and affordable way to add a flash to your point-and-shoot camera system. Everything you need to get started is in the box. Just attach it to the bottom of your housing and start taking pictures.
Features Highlights
• 35 Watt/seconds power with a guide #16 (underwater at ISO 100).
• Exposure selector dial on the side of the sensor provides fine-tuning to optimize results with a variety of digital still cameras. Once you find an exposure level that you like, leave the dial on that number for automatic operation.
• Six manual power settings for full control over exposure.
• Angle of coverage 70°, 80° with diffuser
• Recycle time of 2.5 seconds (Full power).
• Up to 300 flashes with full power batteries.
Power Source
The strobe uses 4 x Alkaline or NiMH "AA" type batteries (not included)
Key Features
Configuration AF35 strobe head
AutoFlash sensor
Flex arm with single tray
Guide No. (ISO 100) feet: 28 surface - 16 underwater
Power Rating 35 Watt/seconds
Coverage Angle 70° (28mm Lens Coverage), 80° with diffuser
Depth Rating 300' (90 m)
Flash Modes Auto, Manual
Exposure Control Six manual power settings
Exposure selector dial for fine-tuning exposure or exposure compensation
Slave AutoFlash sensor
Targeting Light No
Color Temperature 5700° K
Recycle Time 2.5 Seconds
Flashes (Full Power) Approx. 300
Power Source 4x AA Batteries
Dimensions 3.2 x 3.2 x 4.7 inch (81 x 81 x 119mm)
Weight (Land) 1.3 lbs (0.6 kg)