Confused here...
You wrote "I just picked up 2 Fortune 1 cabinets..."
So are you asking the value of empty F1 cabinets...nothing inside?
Or are they complete units?
Value depends on your state/area, in many cases. I'm in California and bought a F1 for $20. I cleaned the potentiometers on the CRT and it's been working great ever since.
It appears you're in Nevada. There's an IGT Game King listed in Las Vegas for $550 now.
But you might get $100 - $200 for a clean working F1, since there's a few collectors out there, provided they see the ad.
I highly doubt you'd get anything near $300 though.