Price of DDRII RAM for Laptop

What will be the price of 1GB DDRII 533 MHz RAM for laptop? I was looking at Galaxy's website and there it is mentioned as Rs.1500 for 667 MHz DDRII. Any idea on 533 MHz!?

Also tell me if I get a 667 Mhz..will it work? Because I read that a 667 MHz ram adjusts on 533 MHz bus!?