I sell Libreboot, and Libreboot accessories.

https://minifree.org/

Libreboot is free/opensource boot firmware, replacing proprietary BIOS/UEFI. I'm Libreboot's founder and lead developer, and I use sales to fund the project.

Libreboot gives you better security and customisation. As a Free Software project, Libreboot democratises the boot firmware, giving you control. It's your computer, nobody elses.

Debian Linux, other distro or a BSD of your choice can be preinstalled.