Sarah,
Try www.sheet-music.com.
Actually, there are scores of websites like this one, which feature searchable databases of sheet music. Just go to yahoo or google and do a search for "sheet music". I searched about 10 of them and couldn't find Apasionata, however.
You might try contacting the producers directly (Casa Musica) to see if they would be willing to work something out. If that doesn't work, you can always hire someone to transcribe the music for you. The price of the transcription would depend on the complexity of the work, how accurate you want it to be (eg basic lead sheet or full blown note-for-note score), and most of all, how many instruments you want in the arrangement. A simple lead sheet or piano + violin arrangement will be considerably less expensive than a complete orchestral score.
I do transcriptions. If you're interested, send me an email at Jonathan@ballroomdancers.com.
Sincerely,
Jonathan