Those are being sold by newegg for goHardDrive.
GoHardDrive is kind of iffy. I've bought a few drives from them and they have all been reliable (so far) and passed preclear with no problem. The one DOA I've had was replaced promptly with shipping paid by them... Both ways.
However, the 2 TB Hitachi Ultrastars I've bought while listed as "New" all showed SMART tests logged at ca. 15,000 hours although power on hours in the SMART data showed zero hours. Apparently they have a way of resetting SMART data on some drives. When I called them out on it they insisted that they were "New OEM drives" and couldn't understand how they were tested at 15,000 hours but offered a $20.00 (each) refund and I keep the drives, or a full refund if I returned them.
A bit of searching on the web showed that this is S.O.P for them and they've been doing it for a while.
I kept them as with the $20.00 discount, it was a very good price and so far after six months in my unRAID box, they're working fine. I'm running 7 of them and have 2 precleared spares.
On the other hand, I bought some 4 TB white label drives and the data in SMART shows that they were actually Western Digital RE drives and seemed to be brand new.
I have 3 running with 1 precleared spare.
They do have a one year warranty and I figure that as with most hard drives, they will either die within the first year, or they will last for many years.
So, having said that, $150.00 is a decent price for a 6 TB drive but know what you're getting into.