May I suggest you look for used unit that goes on the same base. I have seen a few on eBay. Right now there is 200DX on auction for 50 bucks. Some other models for less.
The 200DX appears to use the same base mount as all current 700, 500, the 300 series and the PiranhaMAX.
Just make sure you get a head unit that can use the same transducer you have installed. Look into the frequencies (200hz, dual freq, etc.)
You can also turn around and sell the parts you don't use to reduce your cost.
/bing
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