Picked up my SO last year, along with two B35s and the SO was NOT substantially different in price at all. Maybe I mis-read your post but I personally will not buy an SO if it is priced 40% higher than a normal B/K.
If they charged 40% more than regular bag, I will sadly tell my SA I won't buy my SO when they arrived. I picked up my SO in Dec and it's the same price as the reg B.