Roughly: a flash memory shortage started in late 2016 when everybody but Samsung was having trouble transitioning to 3D NAND flash memory, and Samsung was having trouble with their third generation of 3D NAND. All of the flash memory manufacturers are now producing 64-layer or higher 3D NAND and prices have been coming down for a few months, but they're still higher than 2015 prices.

I think stabilize is a better word, I hardly call a few percentage changes "coming down"

Consumer SSD prices are absolutely trending down. Everyday Amazon and Newegg prices are slightly better than the Black Friday/holiday sales of four months ago.

Strange the NAND price didn't drop that much. Weak demands of SSD?

*NAND price and SSD price never quite trend together or match up.

i paid $75 for a decent 240gb SSD back in 2014.

The price for a similarly decent 240gb SSD is still around $75 today.

Back then I thought 512gb/480gb would be available for $75 in 2017.

Capacity is the same, but how about durability of performance of those drives?

Worse nowadays. Every new process shrinks nand cells, on top of that we are on TLC everything now, while 5 years ago huge SLC chips were norm.

Good 2012 drive was Samsung 830 surviving 10 Petabytes, nowadays consumer drives are expected to survive ~100TB.