Got a note from the CMP that they have received the "last remaining sizable quantity" of 1903's from the US Army. Info on the CMP website if you're interested.
http://www.odcmp.com/

I'm not a Springfield guru, so what do they mean about having a "C Stock" as an option? Complete?

The C stock that is refered to in the add is a pistol grip stock instead of a straight grip stock. These were a bit scarcer.