A site which scrapes and analyzes Amazon at least daily to collect hard drives for sale. New or used, price per terabyte or gigabyte, price per unit, capacity, manufacturer, warranty, link to buy.
No machine-readable feeds, so you'll have to do this manually.
Greyprints for 3d printing a modular hard drive rack. Modular. Mount a bunch of standard PC hard drives vertically. Bolt some fans onto the side to blow air across them and keep 'em cool. Seems like this would be an ideal setup to use with some hot-swappable drive connectors.
Downloaded to Windbringer. Fab, rivet into Leandra's chassis to replace the awkward steel drive backet that requires pulling out all the cards.