As herbray noted, MusEdit is now free and both the executable and the documentation are available in the "Files" section of the Yahoo "musedit" group; you must join the group to get access to them. It's a pretty nice program, and if it will meet your needs, it might be worth getting.
However, you should be aware that it's Windows-only, and may not work on anything after Windows 7. Also, Doug Rogers (the author) has abandoned it. He released it as Open Source and I would guess that someone in the group grabbed the source before the web site vanished (it is not in the group's "Files" section). However, as far as I could tell from the last year or so worth of messages, no other maintainer/developer has come forward. Anyone who has ever had to dig through 15 years worth of someone else's C++ code will understand why that might be.
In the face of good free programs - MuseScore, LilyPond, others I've forgotten - that work on all platforms and are backed by a fairly large (albeit volunteer) development group, it's difficult to recommend MusEdit for new users. If you do use it, I'd strongly recommend being sure to save your scores as MusicXML files, since that's the only portable format supported. Eventually, you will be forced off of Windows XP and 7 and there's unlikely to be a version for later Windows systems.