Still deciding if it will be beneficial to purchase the VIP Jungfrau Pass or the Jungfrau Rail Pass or just get individual tickets.. Can they be purchased once we get to the area and know more about which forms of transportation we will use. A lot depends on weather conditions while we're there, especially the Jungfraujoch.
Every option is sold there at stations.
A Swiss Half Fare Card can be used all over Switzerland - not just in the BO. If you travel to the expensive Jungfrau the HFC will give you a 50% discount which is almost enough to PAY for the HFC. So if you have other trips planned the HFC can be used on those, too. You don't know what transportation you'll be using until after you arrive? I guess that means you're going to be using a car to get there...