I have a BNIB TCCM for a GMT360 4wd truck for sale. It was purchased for a 2004 model Trailblazer with selectable 4 button 4wd drive, however I believe it will fit most trucks of this platform.
I will provide the part number, it is up to you to determine the correct part fitment.
Note that it is still sealed in factory box so I can only provide a pic of the unopened box, unless I'm sure that will be purchased.

Asking for $130 shipped to all 50 states.
This retails for approx $270 on GM partsdirect and well over $300 at a dealer.

 

The TCCM is still available.

 

Part is still available.

 

I still have the part.

$110 shipped

 

$90 shipped. I can't believe I still have this TCCM...

 

$75 shipped for this. I know someone has a service 4wd light illuminated in their trailblazer or envoy.