http://www.car-part.com is a good source for used/salvaged parts for just about any car ever made. If you're really wanting it fixed, you might try buying a whole steering column assembly from their site and seeing if a private shop can install it for you.
You could even take it a step further and take the car to the dealer for a real estimate. Have them tell you the name and part number of the broken part, then go home and order it from the website. A private shop can install anything at a far more reasonable price than any dealer.
As long as you specify that you'd only like an estimate, the dealer is not legally allowed to charge you one cent.