I get the cells at the 18650 Battery Store. They are currently $125 each. I also added the flexible buss bars for $25. So, $525 for the cells. I get my BMSs on AliExpress. The 200 Amp 12 volt version with heater function is about $85. Then there are terminals and wire, about another $40 or so.
The ones I get are 280 Amp Hour with 3,584 Watt Hours. They have several other size cells also.
They ship from Georgia, so quick shipping in the US.
