Purchase orders are allowed on the TroikaTronix Product Page of FastSpring's online store. This is one of the payment options offered at the bottom of the first page after you select the products you want to purchase. You are welcome to personally place the order, select this payment option, and continue with the process.
Purchases of Isadora are made via our online store which is managed by FastSpring, so they are the vendor with whom you will be doing business. Their address and contact information can be found here; for further information please refer to their FAQ. You may also download their W9 form. If your organization is tax-exempt, please refer to this FastSpring article. FastSpring will accept purchase orders, but they do not have a Net 30 policy. Instead, they will show the order as not completed until you have sent them a check and it has cleared their bank.