Sam's club has some good prices
Just make sure you get a true deep cycle battery ( its not about CCA, its about Amp Hours )
If you are going to stay with a single battery - and you have space on the rack, you could up to a grp27 and get a few more Amp hours
Some folks take this opportunity to go to two batteries, in which case you may have to stay with Grp 24s so they fit on the rack side by side.
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes