Hi I think I must be a complete cheap skate!
For a similar boat I would buy a 5 pole 550 type brushed motor. About $15 max. Pitman motors are great but expensive, I have 3 or 4 but these were harvested from American computer tape decks before they were scrapped. Quality electric motors last forever!
I currently use incredibly cheap esc's from China, my last purchase cost £14 (24$) including tax and postage for 5 (five) esc's. So $5 for a speed controller.
Quoted as 10 amps which I do not trust so allow for half that and maximum voltage 8.4 volts, so would allow for 35-40 Watts power and they do not even get warm.
I know there are cries of supporting model shops but I only ever bought 2nd. hand motors from them and other sources were garden sales etc and now on-line.
Perhaps mine is a different view point, but in my early adult and married days I needed to justify the spend on my hobby against family needs. It is different now but the old habit stays embedded in me.
I have over 40 model boats and yachts at home more being built. My last and biggest ever purchase was for £150 for a complete boat kit but 2nd, hand which I have checked over and it is £200+ from model shops if you can find one that is.
Sorry it has gone a bit off thread, however it is good that you have found decent retailers, so well done for that. I think they are the ones that should survive.
My eyes were opened in the UK some 50+ years ago when I wanted some stanchions for a boat I was building. I went to Basset-lowke then in Holborn, London.
They were prepared to sell them to me at £1 each I needed 26!
On just checking my laptop £1 then is worth £27 now. Similar stanchions are still less than a pound even now!
I went off to evening classes and did basic engineering and lathe work! Lesson learned.