Humminbird 360

Hello,

I really want one of these Humminbird 360 units.
I made a mistake and bought a Helix unit that is not network capable but I can update later , I do not mind buying another Unit to Run 360 and later update the one at Counsel so they networked, I can "sneaker net " (transfer waypoints manually for now).

My real question is how do you go about getting 360 the cheapest way. I kinda wanted to get the use out of my current trolling motor which is not the desired model they want to sell you.
Any Tips Tricks or Hacks people doing ?
For some reason I have hard time finding info on these units . There is plenty of videos on its uses but not how to implement it in your boat.