don't hold me to this? I don't think so unless its the iPod mini, if I remember correctly, back in the time, buying an iPod nano was cheaper than buying just the harddrive. this meant people were stripping out the harddrives of these iPods.
This used to be possible with other MP3 players (Archos and Rio) but then people were buying them just for the cheap microdrives. These companies eventually built firmware or something of the sort into the microdrives and they can no longer be used in cameras or other devices.
You can buy a 4GB microdrive for $150 or less. I got one for $129 3 weeks ago at Best Buy.
Currently you can get a 4GB Sandisk CF for $150 and a 4GB Ultra II (one of the fastest CF cards) for $179.