>2TB enterprise drives aren't that widely and cheaply available yet. If you consider that those drives are usually replaced after their 5 year warranty period expires, there weren't that much drives >2TB around 5+ years ago, and those that were had an immense price tag and won't be selling at <200EUR now.
So if you do not need that space right now, maybe have a look at 1.92TB drives, which are much more common to be replaced in large quantities nowadays. Also in enterprise you won't find that many SATA drives - especially for flash it makes absolutely no sense using an half-duplex, single-queue interface that poses a massive bottleneck and neglects almost all benefits of using flash.
I got a bunch of 1.92TB HPE DDYE1920S SAS drives (essentially overprovisioned sandisk 2TB drives) at WAY below 200EUR a few weeks ago and converted my home server to all-flash with 8 of them. They are all at ~1-2% of their endurance rating, so for my data-grave pool they will last forever TBW-wise.
Those 1.92TB from HPE or DELL turn up on a regular basis on ebay, so chances are good you will get a good price if you buy a lot of e.g. 8+ drives. Mine were originally 200EUR per piece, but I got 150/each for 12 pieces.
