This is the access to get the factory price for hard drive PCB:

Purchase Price: USD10/Piece
Package Price: USD60, totally 6 pieces
Package Purchase here

Hard drive PCB package contains the following PCBs:

800022-SATA PCB: This PCB is customized PCB compatible with 800041 USB PCB
800065-SATA PCB: Compatible with 800067 USB PCB
800066-SATA PCB: Compatible with 800069 USB PCB
800077-SATA PCB
810011-SATA PCB
810035-SATA PCB

Please note: above SATA PCBs are used only for Western Digital hard drives.