Ya expensive is right, just look for Laptop hard Drives, there are bigger sizes for cheaper prices.
Stay away from E-bay during the holidays, it's harder to get money back for items during the rush.
PS4 Preordered - 06/11/2013 @09:30am
XBox One Preordered - 06/19/2013 @07:57pm
"I don't trust #XboxOne & #Kinect 2.0, it's always connected" as you tweet from your smartphone - irony 0_o