unlocked

I bought a 2012 535i with only one key fob and would like to add a spare. From what I see online this company keylessremotewarehouse.com claims to have unlocked key fobs, is this true? Has anyone bought one from them before, do you recommend them or not? BTW, I know the physical key inside...

I need your opinion. In view of the maintenance including battery life, etc, should the car be locked or unlocked when parked in the garage?