where to buy corset/bustier?

Hi ladies -

Can anyone suggest a good place to go to buy a corset/bustier that is in Nassau County?

I'm looking for either a bustier, or a one piece corset thing to suck it all in!
I need to go to a place where they know how to measure you and can suggest options.
Tried Victorias Secret, but i felt like they didnt' fit right, so need some professional help.

TIA!!