Unicomp Keyboard
Unicomp owns the rights to the design of IBM Model M keyboard (1985) , and makes modern version of keyboard with the Buckling Spring Key Switch mechanism.

Unicomp Keyboard Review
Here is a interview with Unicomp guy Mr Muyskens
[Old-School Keyboard Makes Comeback Of Sorts By Mr Muyskens. At http://www.npr.org/templates/story/story.php?storyId=100076874 ]
Here is History of IBM Model M, and Review of Unicomp keyboard.
Nov 5, 2016
Chyrosran22
Alternatives
The buckling spring is a old tech. There are many other key switch mechanisms with good tactile feedback.