If the Nook format is actually epub as it seems to be, and since (I think) FBReader and Calibre (the ebook readers that exist for my FreeBSD laptop) seem to support that, does that mean I can buy Because Internet from whichever palatable retailer will let me download it to a non-US billing address (which seems to mean Penguin US or Barnes and Noble as Penguin UK wants over twice the Penguin US price, Books-a-million sells to US customers only, and I don't trust Apple, Google, or Amazon to supply an unencumbered format that I could get onto my laptop)? Or do I have to find another source/way to do it?