Pine usually runs $0.60-$1.00 a Bd. ft. depending on length/grade. Oak would be $0.70-$1.25. I personally use locally available timber, and I would consider something that had to trucked in like Doug Fir to be on the exotic end.
I apologize if my statement was a bit general. Of course everyone has different material costs depending on region. I think my general premise is still valid though. It should be pretty easy to say that a given frame will run about $X.