SSD Market, Solid State Drive Market Size, Share, Growth 2030
Enterprise SSDs cost ten times more than nearline disk drives – Blocks and Files
SSD prices plummet again, close in on HDDs | Computerworld
Disk Drive Prices 1955-2019 (a professor graphs the trend the cheapest price/MB since 1955, last updated 2019Aug17, I'll link the actual data table in comments) : r/DataHoarder
SSD Prices Continue to Fall, Now Upgrade Your Hard Drive!