One can buy 100Ah LiPo on Amazon for around $320 so that's not a bad deal.I converted my 210Ah battery (8 cells) to 105Ah (4 cells) and have the 4 extra cells available for sale.
LiFePo4 LFP battery cells (4) EVE LF105 - general for sale - by owner
I have 4 EVE LF105 cells left over from a battery build. Started out as a 2P4S (210Ah) battery using 8 cells that I changed to a 4S (105Ah) battery using 4 cells. I have 4 cells available. I bought...sandiego.craigslist.org