Honestly - I don't know. A few years back a brand new Yamaha 9.9 High Thrust was around $2500 new which included forward controls, electric start/trim and obviously charging system. I would think if you looked you could find one for a grand give or take...
Have to look at how much you run and what power consumed by everything is when you are fishing - chartplotters, fish finders, speed/temp probes, bilge pumps, stereo, washdown pumps, riggers, etc. I'm not sure what you are running, but without charging it doesn't take long for batteries to get drawn down under these conditions...