you could also get it cheaper if you just bought the 250/320GB 2.5 sata hdd seperately and hacked it to go into your xbox - WD Scorpio Series BEVS/BEAS - WD Scorpio Blue Series BEVS/BEVT/BPVT - WD Scorpio Black Series BEKT/BJKT - WD VelociRaptor Series - WD AV-25 Series BUDT there are TuTs how to do it on our site.
Are you looking to pick one up for a Phat or Slim and is the system in question jtagged or rgh'ed modded. I can line up an exact price for you with the info.