I have used the Jungfrau Pass before and it was worth every penny. But I see the BO pass mentioned here and it looks as though it covers the same as the Jungfrau, but more! Am I correct? I bought the Jungfrau Pass at the Interlaken Ost station. Can the BO be purchased in Luzern or do I need to buy it online before I come?
According to the website you can buy it either online ( print at home) or at a rail station in Switzerland.
http://www.regionalpass-berneroberland.ch/en/pass-and-infos/buy-ticket/
Note that it does not fully cover the Schilthorn cablecar, nor the Jungfraujoch train above Kleine Scheidegg.
You can buy the BO Pass at any station in that region. We like the BO pass better and have bought it 4 times. As I recall the one time we bought the Jungfrau Region Pass, it does NOT cover the lift between Gimmelwald and Stechelberg which is kind of strategic.