Waterproof case for nikon d5000?

I got a nikon d5000, i want to start taking underwater pictures. I got a sigma 18-200 mm lens.

does anyone know a waterproof case i could buy?

A true dive case will cost more than the camera and lens combined… Minimum $1, 500. Most dive cases do not work well with superzoom lenses.

Depending on your actual needs, something like an Aquapac may work for you. Basically a heavy plastic bag… But much cheaper than a true case. Depends on the depth you wish to dive with the camera. If you are not going under 30 feet, the plastic bag will work. If you want 150 feet, you need a real case.