The 40 amp Morningstar is about $500, while this one , that will do just as well IMO (several forum members have this one) is less than half that: eg (but there are many other vendors)
https://www.solargain.ca/product/epsolar-tracer-4210a-40-amp-mppt-charge-controller/I have used the 20 amp version for my three 100w panel array, so I can vouch for the controller working ok. ( Tried them in series and in parallel using the same controller--made no difference in amps to the battery.) I now use it with a 255w panel, while a 30 amp PWM does the three 100s in parallel. That gets the same amps to the battery as did the MPPT controller--18.6 max high noon --Isc of one is 6.2)
EDIT--that was with panels tilted towards the high sun. Don't expect so many amps with the panels mounted flat on the roof unless you are parked at 23N Latitude on 21 June
