What size is your head that you consider large? I measured my own as 61cm, and I struggled to find a suitable helmet. I ended up with a Met Estro, which was the only decent helmet I could find in shops where I live that suited me, that does right up to 61cm in its large size.
By the way, I never ever felt any issue with the size of my head (I only really realised it must be larger than most when I struggled to find a helmet). But then, maybe you're talking of figures quite larger than 61cm... (The link given by Cunobelin mentions helmets going up to 66cm...)