These trucks have independent suspensions front and rear... It's not like a "normal" pickup that you can just go lift 5" for $600... As such, there are no kits available (that I'm aware of) that lift it more than 3" without going some absurdly expensive custom route. That being said, Ben from RoadBully makes a 3" lift kit that will fit these trucks, but he strongly warns against putting it on Sport Tracs. Anything higher than 2 or 2.5" is hard on some suspension components and thus can cause premature wear and failure of certain parts like the ball joints.
I bought Ben's 2.5" front and 2" rear spacers, for what it's worth. He says he's experienced no problems with this combination, but any higher and it may cause problems. It all makes sense when you think about it, you can only go so far before you tweak the truck's suspension geometry too much.