Hi Big Jim,
The prices as posted on backpack.tf for your rocket launchers are:
Strange Black Box: 19.66-19.77 Ref
Strange Rocket Launcher : 19-19.11 Ref
Strange Beggar's Bazzooka : 10.33-10.44 Ref
As for your penguin friend there is no official price, however, most sell orders are around 20Ref and buy orders about 14.44 Ref.
Hope this helped!