Jaycar have currently got this camera on special (usually $99). This is the cheapest I could find from a bricks and mortar store. You will also have to purchase a Class 10 MicroSD card separately (refer to note below).
Youtube video samples
http://www.youtube.com/watch?v=xwbIwXfeSbs
http://www.youtube.com/watch?v=P8tOOu5KDlY
Attachments included:
• Waterproof case (IPX8), depth rating: up to 3m
• Protective shield
• Handlebar seat-post mount
• Suction cup mount
• Helmet mount and belt
Specs copied from the Jaycar Website:
• Screen size: 2.0-inch
• Camera resolution: 1.3MP CMOS
• Camera lens: F3.1 f=9.3mm
• Camera zoom: 4x digital
• Video resolution:
- VGA: 640 x 480 at 60fps
- 720P: 1280 x 720 at 30fps
• Video file format: AVI
• Still image resolution: up to 5.0MP (2592 x 1,944)
• Image file format: JPEG
• Built-in microphone: Yes
• Video with sound: Yes
• Storage: microSD card up to 32GB (Not included)
• Video file size: Approx 6GB per hour
• PC interface: USB2.0
• Power source: 3.7V Li-ion built-in
• Power life: more than 1 hour from 2 - 4 hour charge
• Camera weight: 50 grams
• Camera dimensions: 67(L) x 47(W) x 29(D)mm
Note: The high performance of this camera requires the use of a class 10 MicroSD. Use of a class 4 MicroSD card will not guarantee best performance. Using a class 4 MicroSD card will result in error messages from the camera requesting you to format the MircoSD card, this is because class 4 MicroSD cards are not suitable for this camera. When using a class 10 MicroSD card this fault will not be displayed, and will work normally in the camera.
Seems good for a brick and mortar store. The youtube clips aren't bad.