I'm flying to Melbourne tomorrow and some plans I had fell through so Im going to have plenty of photography time.

I want to do some long exposure stuff and have been meaning to buy some ND filters for years.

So, where should I look to buy some? Anywhere in the city is fine, I'll have a car.

Next question, slip-in style Cokin or screw on? I was leaning toward screw, but am open to suggestion.