$/TB across storage size and type. Interestingly, no price premium for high capacity HDDs.

Interesting how prices different per region. Here in Germany, its mostly 14~20GB drives that are the cheapest, and 12~1TB are not worth buying.

https://geizhals.de/?cat=hde7s&xf=3772_3.5

Ignore the first SAS one, that is one seller on Amazon.

And second hand HDDs are even worse priced on places like ebay. To the point there is little reason to even look at second hand drives. Same applies to a lot of PC hardware, that tends to be more expensive second hand on ebay then brand new from stores.