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Lowrance 4x is pretty cheap, there are also the cheap brands like echo and garmin. You can get a small basic black and white unit for around $100 and battery will run about 30. If you want a waterproof battery that's about 90 or build yourself for about 60-70. If you fish a lot just give in and drop the extra $$ on a color unit. GPS isn't a necessity but a nice freature. Look on craigslist. Just keep in mind a ff doesn't really find fish. You find structure and bait and reading it gets easier with a larger, higher resolution color screen.
Go to west marine or bass pro and take a gander at what they have. Take your sunglasses (polarized) to see how the screen looks at different angles.
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