A wonderful, brilliant sonata. You should listen to Trevor Pinnock's recording (Deutsche Grammophon Galleria 463 220-2). You can get a plain score (Lilypond sources), or a fingered score (Lilypond sources). The fingering, however, is mine: suggestions about a better fingering are welcome.
Thank to Lilypond's MIDI output capabilities, you can even get a MIDI file of this sonata, or (courtesy of Timidity) an Ogg Vorbis digital audio rendition (harpsichord ♩♫; piano ♩♫; organ ♩♫; concertina ♩♫; marimba ♩♫).