It will be $100 per mil. Did you tell him in the comments on the order form that you are a member of RC? If not, you can just call or email him and provide this info. Also, did you check to see if there is a charge for sending the money directly to him? I don't do it that way, so I don't know without pulling up the site and looking. If there is no charge for the payment you chose, then it is simply $100 per mil you ordered. If there is a charge for the form of payment you choseb, it should be a single charge for the entire lot.
Hope this helps,
Patty