I was just searching for a reasonably priced one for a friend. I don't know if this is Mac compatable, but it is said to have good audio and only costs $45 on sale (in the 2 gb version).
http://google-cnet.com.com/mp3-players/sandisk-sansa-clip-1gb/4505-6490_7-32577901.html?tag=pdtl-list
http://google-cnet.com.com/mp3-players/sandisk-sansa-clip-1gb/4505-6490_7-32577901.html?tag=pdtl-list