For more details go to : http://hobbicide.com/M13Taiwan/
And yes, I agree it costs a lot (EDIT: It doesn't cost a lot. I've checked other tours and their prices and this is dirt cheap. Guys who did my first tour felt bad because they paid so little and left tips at the end). But ANY tour that includes vehicle rentals will cost just as much or more. So by comparison....it's actually very very cheap.