Here is a great site for finance:
http://www.peoplefirst.com/pff/default_2.cfm?d=1
I've used them 2x ad have been entirely happy with the complete package.
G is on the mark about the car you saw. Take your time. And in addition, absolutely DO NOT BUY one that doesn't have a good warranty as an option. Investigate the Warranty company. Some are good and some aren’t. Contact a MB dealer service department and/or inde and ask them what the good warranty companies are and you won't be unhappy about the results
Enjoy the hunt