Bottom line; low power Fishfinders are not made anymore. If you want one, there are some good suggestions in this thread. You will find them on eBay, Craigslist, and Amazon, among others.

The one I decided to purchase is a Lowrance x4 Pro. Others include the x4, Eagle Cuda, 242, 300, and some Humminbird Pirahna Max.

I was looking for grayscale (black & white), not color. Available backlight, no bells & whistles to keep power draw low.

I would suggest that if you want one, don't delay in your search. They're becoming harder to get and more expensive.
Kudos to Wally 13 who assisted me with my search.

Happy hunting! 8-)