Depth, speed, and temperature fish finder?

¤Chins Up¤

New member
I have a 2003 13' Boston Whaler that I use in the river for stipers. Sometimes I troll, or use chunk bait. I am looking for a cheap fishfinder that will show me the depth, speed, and temperature. What is the cheapest fish finder that displays all of these things. I have found ones for $70.00 but they don't offer speed which I really want.
 
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