The original Xbox prototype, revealed at GDC 2000, was a massive X carved from a single block of aluminum, reportedly costing around $18,000 per unit.
The CyberFold is a foldable clamshell cyberdeck that bears a striking resemblance to an oversized Nintendo Game Boy Advance SP. Inside is a surprisingly capable Linux computer, complete with a touchscreen, a full QWERTY keyboard, stereo speakers, and a proper port selection.