[korv]

That's a very expensive HDD. Amazon got the 4 TB WD Blue for $65

[83]

I've been averaging about $19 per 4tb SAS drive on ebay (refurbs), though sata tends to cost a little more being the more common format.

I've had great luck with surplus HGST drives, they tend to be more reliable than Seagate.

[tehbeard]

That's very dependent on Amazon actually shipping you the drive, which between my recent experience and tales from a few friends in the industry, is much more of a coin toss these days.