If you downloaded and used the demo version of our software A2Z Migrations for PST to Office 365. And now, you want to buy the license then you can get the full version license by visiting our official page directly.
Purchase OST to PST: http://www.a2zmigrations.com/pst-to-office365/purchase.php
This application works on mailboxes, so you don't need to pay extra money like $ 99, $299 and $499, etc. You can buy full version license and all services will be received at only $ 10.14 per mailbox. But the best thing is that, it is not a fixed amount. It depends entirely on the number of licenses. Once you increase the number of licenses, you will get the rebate automatically.