Wow! WTF?!?!?!
I'm so glad I just bought 4 2TB drives a week ago with a new RAID. I have to buy one more RAID, but I'm moving my four existing hard drives from my USB enclosure to a new RAID, so that'll give me about 16TB of networked storage.
Still, the drives I bought on October 11th (Samsung F4 2TB) have gone from $80 to $160. Amazing to see that happen.
I should be good for about 6 months with what I have, so I'm hopeful I won't find myself in desperate need for more.