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
IaaS Pricing Patterns and Trends 2020 – Alt + E S V
SSDs will crush hard drives in the enterprise, bearing down the full weight of Wright's Law – Blocks and Files