I would think that all infant seats come with the base because it's required to actually use the seat. They sell bases separately as extras, but I don't think they're generally sold as two parts.
I have this carseat and also bought it from Amazon, yes it comes with the base. Not an extra one though. Inside the box is the removable infant seat and one base to install in a car.
Re: please answer this silly car seat ?
I dont think it is as this is what it says in the description:
What's in the Box
One BRITAX B-SAFE Infant Car Seat (Black) and owner's manual.