There are decent prices to be found on common auto battery sizes, but if you are looking for good prices on odd size, farm, HD, commercial truck, etc. batteries I discovered that Advance Auto offers 25% off if you are willing to give up your email, order and pay online, then pick up at your local store. I needed a pair of group 31's for my box truck and saved almost $70.00 in two separate transactions. I placed an order for one battery, then in bounced a second 25% off offer. Initially, I was prepared to give up a second email for 25% off a second battery in a separate transaction, but it was unnecessary. $200 for a pair of truck batteries with almost 2000 CCA is pretty good.

They may have a good price for your size with the discount. I always use Walmart EverStart Maxx which has a 3 year warranty.