Depends if you want a factory FM3 car, and what you consider "payable".
I'd say a factory FM3 challenger ragtop, even a 318 auto car..in driver condition would be a $50-55K plus car. FM3 factory cars bring a premium, and the droptop just makes it even more expensive.
Now if you are talking about a car thats not factory FM3, that could knock off a good $10-15K.