Here are 2 schuberth C2 for sale on ebay from a seller I have bought from and highley recommend;
HEIN GERICKE SCHUBERTH C2 HELMET SIZE XL - Lot 146 Item number: 250433354007 current bid £137 8 hrs to go.
HEIN GERICKE SCHUBERTH C2 HELMET SIZE XXL - Lot 190 Item number: 260418383793 current bid £67 8 hrs to go.