I might have jumped the gun, but just ordered two 100AH TimeUSB Pro batteries direct from them. $414 - $25 (Pro6 discount code). Thx Thill for the recommendation.
PS: They are also raising the aluminum tariff, but not clear to me me by how much. It will drive new boat cost higher and eventually used.
Apparently, the current tariff is 25% being increased to 50%. While not 100% clear, it sounds like LiFePO4 are on the list, because it was mentioned that Ford uses them in some trucks and mustangs. Also, some Tesla 3's.