Can anyone recommend a good entry level unit for around 120-200$

I would suggest a lowrance mark 4hdi. It is in your price range gives you the new dual hybrid transducer and is also a GPS.... Only down side is it's monochrome not color.

I like the Mark 4 black and white, has gps, amazing clarity, you can see your line go down and jig up n down, well under $200

just picked up a lowrance 4x HDI for $199, but haven't had it on the water yet.  literally just got done hooking it up last night.  It's installed on my kayak so it may be a little different for a boat,  but i'm please so far.  I had a Garmin echo previously and would not recommend that one.  it was user friendly, but not very clear or detailed.  very easy installation with the lowrance last night