The Star Labs Systems (npub1hpu…ggnf) StarLite used to be. Up until the current revision (5) it was a 12” laptop for £400 built for Linux and is a great little machine (I have one and love it… I also have a revision 2 one which I have Windows on for configuring our GPS devices).
The current one is a tablet with detachable keyboard which appeals less but I may try at some point (but I may wait for revision 6 first to see what that updates).