I'm not sure who runs it, but I can confirm that the "subscribe" box unobtrusively located at the bottom of the page works and makes sure you don't have to depend on catching it on the HN front page.

Do note that they seem to remove it at the end of the month! You can still see some of the scans from the last couple months at https://web.archive.org/web/*/scanofthemonth.com.