Visual X-15
The Visual X-15 is a monochrome graphics terminal for the X Window System introduced in February, 1990 at a price of $2,195 (1 MB RAM), $2,595 (2 MB RAM), or $3,095 (4 MB RAM).
References
["Small-Footprint X Window Display Terminal Ships", InfoWorld, February 26, 1990, pg. 24