I have just purchased a Mangement Membership and was very suprised when the amount was debited.
You advertise the membership for $149 in the ordering form. That's what I expected to pay. However, as this is an international forum then I beleive your order forms should state you charge in US dollars, that I way I wouldn't be too suprised when I am charged over $200 Australian for the same membership.
My two cents worth.