Thanks!

It's this product, which is built around a ED133UT2 panel by E Ink: https://www.waveshare.com/product/displays/e-paper/epaper-1/...

You can find this unit and other IT8951-based driver boards for it on a few different places/in different catalogs but Waveshare's easy and the price seems OK.

The ED133UT2 is a Carta 1200 display. The latest Carta gen is the 1250, but AIUI it's only relevant for color displays with the change being a thinner film that allow plastic color filters to be closer to the ink to improve contrast. I think the current greyscale 13.3" offered by E Ink's direct shop for $449 sans driver is still a 1200 - at least many vendors list VB3300-NCB as just an alternate name for the ED133UT2. The Carta range of displays are well-known from Amazon's Kindle and many other reader products, so my newspaper is basically a big honking DIY Kindle.

They also offer a 10.3" panel with even higher resolution for half the price of the 13.3" that's supported by the same controller and should be fantastic for all sorts of home dashboards.