Exercises for getting lean

I have Turbo Jam and do a lot of cardio. I've also started to Turbo Sculpt, but I've actually been gaining weight - not sure why. For those of you focusing on losing just a small amount of body fat and increasing muscle, what is the best way to go about this? I have maybe nine pounds to lose the rest of the tummy chub, but really want to look lean. I've heard a lot about p90x. Not sure if I want to spend the money. Any advice on what has worked for people when it comes to toning up when there really isn't a lot of weight left to lose? Those last ten pounds are hard!!!