Where can I find an up-to-date copy of your W-9? Sam Clark November 07, 2020 00:31 Updated The W-9 form is attached to your quote. You can also access it directly here. Related articles Which address should I use on my purchase order? How do I access my quote or create a new order? How do I submit a purchase order? What is the mailing/billing address for Mystery Science? Do you offer classroom memberships? Comments 0 comments Article is closed for comments.