If you are going on price value per Ahr, hands down the BEST pricing will be Duracell..
I would recommend checking out Sam's Club or Costco for GC2s, if you have a membership Sam's carries Duracells, not sure about what Costco caries but their prices tend to be competitive with Sam's on GC2s.
FLA GC2s at Sams is typically running around the $89 each mark each and they are carrying AGMs for about $10 each more..
The difference between Duracell and Crown.. Duracell offers 3 yr Prorated warranty, Crown? They used to offer a longer warranty but now looks like a 1 yr replacement? And their batteries cost considerably MORE..
PER HERECrowns basic offerings..
CR-205 (205 Ahr) for $150 each
CR-220 (220 Ahr) for $160 each
CR-235 (235 Ahr) for $170 each
CR-240 (240 Ahr) for $175 each
and they go up from there if you want AGM..
Sam's Duracell GC2 is 215 Ahr and at $90 each a much better value than Crown..
Some folks do feel they get far superior batteries and will outlats the cheaper batteries by buying the more expensive Crowns, I am not in that crowd..
Feed and take care of any battery and it will last a long, long time..
Ignore them and don't take care of them they all will fail before their time.
Proper care is essential to ANY battery if you want the maximum life possible.