In Australia, Floor Mats are standard on the 250 only.
They are included in the 'Exclusive' or 'AMG Exclusive' option packages.
I think we have a somewhat different situation here, in that MB Australia has chosen to go with a very strict and limited number of option packages in place of being able to customise individual items.
Things like heated seats, or pano roof are not available seperately, but instead fall within an option pack. Heated seats in the 'Execuitve' (or 'AMG Executive') and pano in the 'Vision' pack with Bi-Xenons, DRL & LED tailights.
That said, the packages available do seem to represent very good value.... but gee I would have liked to tick and flick some individual options.