And my hourly fee is six hundred dollars. You're not in Kansas anymore.
In the "Wizard of Oz," the movie that the characters in the chairs are from, the main character says "We're not in Kansas anymore" in reference to the fact that they have been transported to the magical land of Oz. Here, they are in an expensive lawyer's office instead of Oz, and the reason why it's "not Kansas" is not whimsical --- it's because the lawyers in this city (probably New York) are more expensive than in Kansas. The lawyer uses the same line from the movie to justify his high price.