Hmm, not sure on the predefined sizes Ken. Can you setup a custom page size? I have Acrobat full version, so for example I can take the EPS or TIFFs that Finale produces and use Acrobat to "print" them to a custom page size.
If nothing else you can do like Natch suggests and use the Finale Notepad to print to the smallest size it offers and then use one of the free PDF resizer tools to resize that PDF to the size you need. Not sure how that will work with the page breaks on musical notes though... worth a try.