What's the cheapest used Nikon FULL frame DSLR?

What's the cheapest used Nikon FULL frame DSLR? - 1

The nikon d7200

The cheapest "current" full-frame Nikon available is the D610. You could also try finding the older D600, which is very similar to the D610 and a whole lot cheaper.

In used, your cheapest option will be the D600 if you can find it.