The $153.72 price only seems available if you have Prime. Shows as $161.93 with free delivery without Prime for AU stock with faster delivery. (there's already a deal posted for this).
I had previously ordered a more expensive drive, but upon doing a bit more research I settled for this more budget option.
Edit: 20/8 updated the prices, might be better off ordering from Amazon AU for $162 with free and much faster delivery than from the UK.