do you plan on reinstalling everything from scratch?? if so, then just buy a HDD from anywhere, plug it in and go.
if you want all your current settings, data etc migrated over, 1) buy 2 Laptop HDD adapters (allowing you to plug the laptop HDD into a regular system) and use a Maxtor/WD/Hitachi utility that will allow you to do a sector copy from old HDD to new HDD.