I am using the X2 Power battery from Batteries Plus, so far very pleased with the performance though it's only been about 15 months so far. Number of stores, availability and warranty made it a good choice I feel combined with specs. They have a number of good auto battery options.
Yes it is and I did look at Sams but little to no stock. The thought was if I had a failure Battery Plus would be a better option. Time will tell