Alas, the $80 10TB drives will not materialize anytime soon. Amazon cancelled all orders, and appear to have issued $20 conciliatory gift cards in apology. I spent a few minutes on a support chat trying to talk my way into the discount to no avail. Sad face.
But hey - $20 is more than I had a week ago, even though I would rather have the drives. I'll fill those bays eventually.