Just replaced the battery in my 2010 Roadster with an Interstate Battery from Costco. Price was $73.99 plus tax.
640 CCA. (800 Cranking amps)
I believe the warranty is 48 months.
Quite the deal I think.
And thanks to whoever posted the instructions on how to remove the battery (unfortunately I cannot find the post now)
Not sure if a novice like me could have figured that out on my own.