I saw this and i think it costs quite cheap but reliable anot... i dunno.
http://www.nereus.com.hk/en-product.php
look at DC-WP500 for LX3
Features:
- Waterproof within 20 meters
- UV protected polycarbonate lens
- Transparent soft cover supporting all kinds of operation of camera
- Strip assuring waterproof effect
- Qualified for waterproof tests
- Suitable for most small digital cameras
Material
Waterproof strip: plastic, stainless steel
Waterproof cover: PVC, TPU
Lens: polycarbonate, colloidal silica