I think it's actually much easier to find a decent 03-04 Cobra than a nice Fox 5.0 five speed coupe, but I still don't think the Fox commands nearly the same dollars, all other things being equal.
I would say quite the contrary as far as finding a fox vs terminator.
I was speaking to the price difference between the two. It's easier to cough up the money for a fox than a terminator. It would have to be a pretty jam up fox body to be in the ballpark, price wise, as a Terminator.
There are lots of foxes out there. Granted, not many that aren't dirty or hacked up.