Just received an alert that these were back in stock!
Go in through this link.
https://www.wdc.com/bin/studentPurchase
Scroll to the bottom to " Internal Hard Drive Storage"
Select WD Red NAS Hard Drive
Make Sure Form Factor is at 3.5
Select 8TB from the drop down
Add to Card should appear, if not then its all gone
This works out to $26.37/TB before tax.
These have 3 YR Warranty and are straight from WDC.