Our research indicates that at the time of this post, the 10TB WD MyBook Desktop USB 3.0 External Hard Drive is $170 lower (~68% savings) than the next best available price from a reputable merchant with prices starting from $250.
No Longer Available:
Amazon has 10TB WD MyBook Desktop USB 3.0 External Hard Drive (WDBBGB0100HBK-NESN) for $79.99. Shipping is free.
It appears all hard drives are being cancelled except for the 8tb which Amazon is offering to ship one (YMMV). All cancelled orders are receiving a $20 credit to their account. Also, don't call their support number and ask if this is a price mistake.