Still another new option: http://www.bswusa.com/proditem.asp?item=PROTRACK
This is a clever concept. iPods are ubiquitous. Note, though, that a hard drive iPod is a bit more fragile than a flash-memory recorder, and heavier with this contraption around it. Still, though, a library or charity may be able to solicit donations of old iPods and end up with a cheap solution here.
-- Tom Fine