I have a level 24 Sorceress ready to act as a bumper for normal difficulty.

Is this something I can typically trade for FG?

you can typically trade it for a grush

Baal until 40 so you can bump normal and nightmare. Then its a chargeable service if you're patient, or a free spot in a grush if you're not. Pay depends on where you're bumping, do a search for the going rate.


Nobody really bumps to nightmare and stops, its almost always to hell.

Yep, do Baal runs to 40 without killing Baal. A bumper has to be level 40 to have any demand really.