Make a base out of wood (or better yet HDPE if you have access to it), buy a trophy angler flasher bag, buy the battery you want and glue it to the base, and then screw the transom ducer to a T made of wood (or old tipup). Ready to go ice fishing for $25+ battery cost, and a heck of a lot more portable and compactable than an ammo can or storage box. I've done the ammo can thing, its not practical for me.
In about 2 months you will be able to get an ice ducer for a good price for next year.