FUN FACT:
I provide Libreboot-based service on Minifree but I also do a number of custom machines for people, including ones that have other coreboot-based firmware.
I've decided to make this official. In particular, I now directly state there that I also provide Canoeboot installations via send-in or custom order.
My computers have a free/opensource BIOS/UEFI replacement by default, usually Libreboot; I'm Libreboot's founder and I also maintain the Canoeboot project.