another source for agm batteries

Shipping is going to significantly increase the cost of AGM batteries. However, I see Amazon offers free shipping with the VMax batteries. If one was going to get 12-volt Group 31 VMax batteries the 125 AH VMAXSLR125 would be the one to get. The Vmax AGM batteries only have a 12 month replacement warranty. Compare that to a 2 year replacement, followed by a 3 year prorated, warranty for the Fullrivers. Fullrivers have a North American wide distribution network, so you should be able to pick them up within a reasonable distance from most locations. Have you considered changing to 6-volt batteries in series/parallel? Eight Fullriver DC220-6 batteries would give you 880 AH. Oh, I just reread your first post stating you are replacing four batteries. I'd call Magnacharge Battery.