Shopping for this stuff drives me nuts!
Garmin GPSMAP 741sx two years ago for $1400 it's now a grand.
It will do side scan for another $600
At the time side scan wasn't at the top of my list, radar was.... Didn't spring for either. Also thought all that was needed for the side scan was a different transducer ,,, wrong!
I will say, once I got accustom to the touch screen and menus luv it.
Next one will have a thru hull ducer and radar for sure.
Happy hunting