Buying an AGM online?

Naio wrote:
So I exchanged my new AGM chassis battery, and the next one is worse than the first one. I hope I can get them to give me my money back, we will see.

But it seems that buying an ATM locally is not a realistic option. I think somebody here, maybe Landy, mentioned buying them mail order. Is that actually a practical thing? I just assumed that shipping cost would be crazy.

If it's practical, who do you all recommend? I guess I'm looking for a fresh Johnson Control battery, since I can't afford a lifeline :-)