you're chasing a ghost! As of now, it doesn't exist.

Here is your best choice:

1. Use Modernbill 5 for billing
2. Use Kayako for support
3. and manually code your sales pages (you can even purchase a template) or use Joomla CMS etc for that


EDIT:
Sorry, forgot to mention, what you're really looking for is a Joomla "WebHosting" template.. right? The thing is that 80 of small hosts will have this template, so that'll be a total shot in the foot