toshiba makes an MP-3 player that includes a 5GB pcmcia harddrive that I scored for $170.
My nephew has a 512 flash memory card-in-a-pcmcia-sleeve
MP3 player and I got a 5GB tosh harddrive, cheap-ish.
Right now the drive is in a PDA running the PDAudio card and Live!2496.
I'm thinking about the FR-2 or a SD722, if they ever release 'em.