Polarizing lens for FZ18

Living in Florida I decided that I do need a polarizing lens for my camera to really capture the blues of the water/sky and not be washed out looking. Anyone know where I can get one that will fit this camera?

I just got my DMC-FZ18 yesterday, late afternoon - which is replacing my DMC-FZ20 for it. YIKES.. lots of changes - I keep forgetting to take the lens cap off and get the error message - something the FZ20 didn't do, however I do like that they have now attached the lens cap to the camera as I've had to keep a stash of 3 around due to losing/misplacing them. The menus/buttons are fairly the same although I keep trying to turn it on at the wrong place. Looking forward to seeing what it can do today.