We want them for the rotors inside them (they'll get used in artsy projects).
I may also look for old CDROM (1 - 4X) and floppy drives, if dirt cheap; they often had a stator that looked like a small radial engine. Two VS80 DLT drives I disassembled had a 12-coil stator that was over 3" inner diameter and look great in one of the projects.
Example (still attached to the board)
