[1.2.331] [KOR] Mechanic Skill Tables

Assuming they still have free NX in the CS, this is very probable. (mass cubes)

Those are long gone from testing.

They have never been changed from their original price, to 0 NX. If they did change it, they would do it like what they've done before and change it to 1 NX (you only have 1 Maplepoint in KMST)