I always take notice when people mention Arais. Are you familiar with the helmet shapes? Are you sure you want an Intermediate Oval shaped helmet?
Have you worn other helmets and ended up with a red spot on your forehead after wearing other helmets?
As Stan has said, Arai does not allow\provide leeway for discounting their helmets. Pretty much the cost you see and site 1, will be the same at site 2, 3, 4, etc.
Best you can do is free shipping and fine a stellar return policy if it doesn't fit right.