"Deal of the day" (ends in 8 days) - as usual not the cheapest it's been but sadly not a bad price (~$30/TB) for the current times.
Expect delayed shipping if strikes go ahead, etc.
I haven't tried it personally but apparently you can get an AU power adapter from WD if this doesn't come with an international power adapter.
For people buying this, regarding AU adapter:
via johnmelb's comment & xecutor
Sign Up for a Western Digital account (if you do not have one)
Once signed into the site go to https://support-en.wd.com/app/account/profile or just click "Update your Profile"
Fill in all the relevant fields like your address, then register your new WD 10TB drive "Register a New Product" you will find the information as a sticker on the rear of the external drive case
Then create a "New Support Incident" and then select the following options
Product Type Other WD Products
Operating System Windows 10
Category Warranty & Replacement
Serial Number [Enter this info found on the sticker near the rear of your external HDD drive case]
Firmware Version [Leave Blank]
Summary Require Correct Power Adapter
Description Hello, I recently purchased the WD 10TB Elements Desktop External HDD through Amazon.com.au however the item came with a UK type power adapter. Could you I please receive an AU type adapter for this drive. Thank you. My Address Information: [List your address]
Western Digital support are really good at responding to your enquiries and will send out the correct power adapter for free but expect a longer wait time due to COVID-19. I know pre-COVID it was delivered within 10-14 days.
$30.13 / TB (Free shipping)