I think Browndog just made a typo, but the unit in the classifieds is $490, which is a great price for a 9″ Helix. Like many others, I seriously considered buying it, but I want to hold out for a Gen3 or newer so I have the option to run Mega Live if I should want to in the future.
For $490 plus $100 for a new ice transducer, you would have most of what you need. A shuttle can be had for anywhere from $30 to $100, and a lithium battery, if you wait until Black Friday, should be available for $50-60, then you’d have a complete ice fishing setup in addition to a great open water unit.