Not sure where else to guide you other than benzworld or finding a good Mercedes salesman but I can say Mercedes tends to produce a lot of inventory, leaving a lot of good deals to move them and generally pretty easy to find what you want without ordering.
I'll also say the seats in the C class are atrocious, terribly uncomfortable. I would recommend an extended test drive before deciding they seem ok (as I did but on long drives they really are awful and by long I mean only anything over 45 minutes). And there is a lot of body roll despite pretty good handling. But drive one and decide for yourself. I think the c coupe may come with better seats and E class and above as well.
Personally, I like the driving feel of a BMW or Audi better over all.