I believe you will find that the Nightforce software is the same as Exbal which can be ordered "here at Perry-Systems website". The site says $70.00 for the single package or $122.50 for both Pocket/Palm and PC. I also have it on my desktop PC as well as in a Palm for the field and I would not be without it. It's a super product.
Dick is correct, might be a tweek or two added to the Nightforce program but it is Exbal. Not sure about cost because there are several prices, depending on what you need.