In reply to fxceltic: having just re-read the title of the thread I have realised you want an instructor, not just a guide, sorry.
in which case the price quoted seems reasonable to me.
I repeat though, you should be ok without in rjukan, learn as you go, on a top rope if necessary.
Alternatively you can get cheaper guides in scotland, may be more reasonable to go there first, learn what you think you need and then go to norway.