Looks like you have it all sorted out. I guess it is coming into winter in the Northern Hemisphere but there seem to be a dearth of people posting on the site. Maybe the election has everyone spooked.
The battery prices are pretty different, as you say they probably buy the internals from China then just put them in a case in the US. And jack the price up by 10 or more times.
Here in Oz things are changing a fair bit. Our Prime Minister managed to get the Chinese upset by saying things they did not like. They have put embargoes on our exports to China. Well most things they don't really need, they have not embargoed iron ore as they need that.
And buying things from China has become a very very slow business with Covid19 and slow postage, plus I suspect the government there have mandated a go slow on sending things to Australia.
So maybe Covid has been good, we may end up making our own things again and not being so reliant on imports.
Wish you well with the move.
Me well I prefer cold climates so Tasmania suits me well. Above 19 degrees C and I think it is too hot. No air con, just heating sometimes needed here.
Cheers
Pete