When will you sell the script? and host service?
Discourse is available under an open source license. You can grab the sourcecode from Github.
For hosting, there’s at least one third-party provider that offers fully managed forum hosting.
The Discourse.org team is starting to offer hosting, too: http://www.discourse.org/buy/
Not to take away from the discourse.org team but setting Discourse up via Docker on Digital Ocean is reasonably priced and easy to get going. If I can do it I’m sure anyone can 
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That’s great! We want everyone to be able to run their own Discourse, for any reason, anywhere they want.