You can purchase multiple MTDISCs by adding to cart on this page and then changing the quantity. Once you've completed the purchase, go to your account (there's a link at the top right of every page) and look for My MTDISCs on the left hand menu that appears. You'll be able to enter the emails of the people you'd like to send the MTDISCs to there, and the backend system will inform them and allow them to complete their questionnaire. You'll also be able to see who has completed and who is still to do so on the same page.