Dell sells a VisionTek 16TB for... $3800.

https://www.dell.com/en-us/shop/visiontek-16tb-class-qlc-7mm...

(Rural problems: I tried to find a used car under $3800 on Craigslist here and there's less than 5 vehicles total 'by owner' and none of them drive on their own power. Maybe this is a good deal?)

Only a factor of 20 higher than the equivalent 16tb spinning rust. Not as bad as I expected to be honest.

If it were PCIe it would be a screaming deal, but it's sata. That would take a hot minute to fill at a max 500 megs/sec.