Well my replacement certainly can't be called "affordable", but I need(ed) a battery that can tolerate our -40 F (ambient) winters here. I bought an Optima red top battery the very first winter I had my tractor. The first time the ambient air temp hit -30 F, the OEM Interstate battery died stone cold dead. We can't have that now. Not here, anyway. That would be like having a battery that died from "too much sunshine" in TX or AZ.
That Optima has been in service for six years now, and tolerated every winter since. It's never parked anywhere that's heated in winter (coldest ambient air temp so far has been -45 F), and no need for any foolish "battery blankets", "battery tenders" or any other falderra. It's never needed a jump start, even going for months sometimes between uses.