[Elecraft] Directional Coupler/Panadapter TX Sensor Question

[KE8G]

Hi All,
I have a  Elecraft Directional Coupler/Panadapter TX Sensor that I never
use.  It came along in a package deal I had on a K3S, so it's just sitting
around in the box with its E467139 cable.  The last time it was used was
when the original owner demoed it for me prior to my purchase, since then
it's been boxed.

Any idea of what it would bring, if offered, for sale?

Thanks in advance.
73 de Jim - KE8G