"Cadillac has upgraded the Escalade in various ways, including being able to choose between three body styles, improvements to the OnStar system and a new engine that produces around 403 horsepower."
A cadillac escalade ext is a vehicle that is currently in the luxury market. Nowadays, it is priced around the mid-$50000 range. It can be really expensive for a regular person.
There are several Cadillac Dealers in Chicago as well as several user car dealers who have Cadillac Escalades in stock. You can also order right off of the Cadillac site