Where can I get support for problems which are internal to Unity?

The problem appears to be inside Unity3D, at least that is what the stack trace tells me, so I likely need a Unity dev to help out.

Like almost everyone else, I have a deadline, so I want to pay someone to solve my problem, or at least tell me I’m doing it wrong.

If this service is available, where do I go for it?

You might want to consider Premium Support. Don’t know the cost