In my experience, Hard disk prices don't usually drop far below 100-120 usd while they are still actively being sold.
Yes, cheaper disks exist, they are usually end of the line outdated older models that are being cleared off the shelves.
Yes, 2TB disks are still around that here too, except for some rare ones going for 70 to 80. (some are 5400rpm models)
Biggest reason for non dropping price is likely that the next "big" step in storage capacity has not yet been reached (relatively, not even needed in desktops, 2TB is a lot of space) and as such, factories are still making 2TB disks and I would suspect that said 100 to 120 is around their "it's fine, still turning profit, we are comfortable here" margin.