For those that do that: Cost at wholesaler is 120k for each one. If you sell them like I do, you get 80k.
I want to sell them to players for100k each. Its saves the player 20k per cinder wall, and adds 20k coin for each one I sell.
Hit me up in game any time. I never know if I'll have 5 or 30 but always willing to sell whatever I have. At the time of this writing I've stockpiled close to 25.