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Middle unit of a town home, huh? I guess that rules out gable vents.
Have you inspected the soffit vents? Are they blocked with insulation? If they are clear, then I guess a roof fan really is your best bet.
To be honest, this is the kind of thing I avoid. I've never cut a hole in my roof and flashed around it. I know they have those sticky rubber membranes for flashing around things like this, but I understand metal flashing is even better. Only problem with metal flashing is you need a metal break to bend it, and I'm not sure you can rent one. I'd probably use the sticky rubber membrane to seal things up, and then patch in the shingles.
Maybe somebody else will have better advice.
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