The Internode Mirror contains a wide selection of software for download by Internode customers.
File Download Mirror Directory Listing
Index of /pub/debian/dists/testing/main/installer-arm64/current/images/netboot/debian-installer/arm64/grub/
Index of /pub/debian/dists/testing/main/installer-arm64/current/images/netboot/debian-installer/arm64/grub/