Sorry, had to re-post due to my previous post lacking in details.
So here: got the drives here: https://www.ebay.com.sg/itm/204806952151
It was slightly cheaper when I got it. But it's one of the cheapest options you can find anywhere even now. The next step is 24TB drives which are not sold factory recertified as of yet, so they would cost.. about 50% more than this. I was concerned that some of the disks will arrive damaged, but as you can see it comes very well packaged, and they all passed testing. I put them into a Xpenology home made NAS. which is basically a itx motherboard inside a NAS case (jonsbo N1). It works like a charm. with one disk redundancy, I got about 80TB of fast storage.
They cleared the hours on it when they recertified, but not the rest I think. But all the disks passed testing and are not making any suspicious noises or giving any issues.
https://preview.redd.it/j8twcye0lx4d1.jpg?width=2252&format=pjpg&auto=webp&s=475f00412a29c91cfd843f91e5f9da83f440c8c5
Seagate 22TB Sata Hard Drives