Stealth units are $239.99 for an AB pair, $159.99 for a powered A or B. Don't seem to be any lone dummy B units.
Thank you for the update.
If you buy the stealth A-B set, you are paying eighty dollars for a dummy B. When was there ever a dummy unit worth eighty dollars?. I will pay the extra money and buy a separate A and separate powered B.
The blue in the photographs of the B&Os looks too light. It is not quite as light as the so-called "Powdeer blue" of the RRs or early C-C B&O power or passenger cars but it does look like the blue on the old MiniTRIX B&O F-units. I will have to see this one before I buy it.
It is good to see that the Penns come with antennae.