Another thought on this is if you have a smart phone you can install the Navionics App and use that as your GPS. Then pick up a basic non-GPS locator. If you ice fish you have the stuff on your phone to use as a map as well so it's pretty handy for someone who doesn't want to or simply can't fork over a bunch of money for a combo unit.
Keep your eyes out on various fishing sites besides this one. Guys will be selling their used locators and you can find some pretty decent deals on them....or check places like ebay or craigslist. They pop up on there all the time.