I got the prices from a 2004 Rick Steves book that I purchased for $1.00 (it is obviously now a little out of date).
I also can see that I mis-calculated the price for the train from Oslo. According to the site now, you can buy a one way "minpris" for 199 or 299 (availability) or "ordinaer" for 728. Supplement to First Clas is 75. (All prices NOK).
There are some rules about having to take direct routing for "minipris" in the Terms & Conditions. Does anyone think a minipris ticket would work for NIN? (Get off in Myrdal, Get on later in Voss to Bergen)
Thanks!!