This is the 100A LiFePO4 from Redodo.

I've had this in my Amazon shopping cart and I see that today's price is very good. $269 - $40 = $229 with free shipping.

I ended up buying another pair at an even better price. $455 - 10% = $410 or $205 each (but you have to buy a pair)

https://www.amazon.com/gp/product/B0B2QP1T5T

Note that these physically are the same size as a lead acid AGM 100AH battery so it fits into battery trays that used to hold AGMs. 100AH 12V LiFePO4's are also being sold as 'minis' where the case is smaller, but many of those are using pouch vs prismatic cells. I don't have an opinion on one being better than the other (pouch vs prismatic), just letting you all know.

Dave

AI6VX