[coreboot] Suggestions on shipping ARMv8 Chromebook

Folks,
As we work on our own implementation we are kicking around purchasing an 
off-the-shelf ARMv8 Chromebook.

Main requirement is that it has a nice clean software build in the 
chrome/coreboot trees.
Prefer no binary blobs, but that is merely a preference.

Does the community have any suggestions?
Cheers,
T.mike