Red and Blue Sandtex finishes were part of the initial Panzer Fight Stick 3 pre-order run back in 2016. They were discontinued as regular options in October of 2016.
White Sandtex finishes were continued until May 2017 and were discontinued due to low demand.
Each color has been added back into the "Special Monthly Color Run" queue and will be making special appearances in the future. Unfortunately, the schedule is kept strictly confidential and cannot be publicly shared.