Randy,
The 341TG is still (currently) listed as an available floorplan, although it's possible the Keystone website hasn't been updated recently.
There are 2 other models listed as "stock only", which means they've already been discontinued, but the 341TG is not labeled as such.
http://www.keystonerv.com/avalanche/#/floorplans
If it were me, I'd call Keystone directly to ask if the 341TG has also been dropped from the line-up.
http://www.keystonerv.com/customer-service
You might also call some other dealerships [to ask about that model]... many of them have toll free numbers!
http://www.keystonerv.com/find-a-dealer?brand=Avalanche
A Google search brings up 'several' 2014's for sale across the US, maybe the dealer could get one of those for you?
It does sound as though "someone" goofed at the dealer or Keystone, and hopefully you can get this resolved soon.
Good Luck & please keep us posted on the outcome.
Terri, the Chevy co-pilot