Tervs are pretty laid back compared to the other three Belgian varieties - atleast the ones I know and have met are. That being said, Tervs are also extremely active and full of drive - imagine a Terv with 10 times more energy and drive...that's a Mal. Malinois are not easy dogs to deal with generally and I definitely wouldn't recommend them to 95% of people out there. They're extremely high drive, intense, energetic, always on the go dogs. They can be hard to control for most people and constantly need to do something. They aren't any more expensive than most other breeds (around $1000-$2000, give or take some) and like other breeds, they can be found through breeders. There are quite a few Mal breeders out there, but not a lot with stable temperamented dogs. Besides that, I don't know a whole lot else about them as I never really researched them as much as I did the Laekenois, Groenendael, and Tervuren as I don't want a dog with short hair. Hopefully Wolfsoul or SummerRiot sees thus thread as they'd be able to offer a lot more insight on the breed.
All of that being said, if you're thinking of getting one yourself, I honestly don't think a Malinois would fit into your lifestyle very well at all for various reasons.