Tektronix XP338P
The Tektronix XP338P terminal is a color graphics terminal for the X Window System that supports the PHIGS Extensions for X (PEX) introduced in December, 1992 at a price of $6,495.
References
"Tektronix X terminal increases speed of 3-D graphics tasks", InfoWorld, December 7, 1992, pg. 36.