If you purchase CC subscription , you can install CS 6 version , it is included with subscription .
I am confused... you say you are running CC CS6, which SHOULD mean you have a Cloud plan and you have used the special process to install CS6... is that what you mean?
Or do you mean that you want to buy CS6 that is NOT part of the Cloud? - Link to buy CS6 via telephone http://www.adobe.com/products/cs6.html
our subscription has been at CC CS6 - no plan to upgrade past this version yet. Looked to install some other software - but, noticed not available in CS6 version. after the 30 day trial what would the added cost total?