The labor for removing the decals is going to be the expensive part; if you have the energy you can do them yourself you can save a pile of cash. I used to work detail shop; you can get an 'eraser' that goes on a cordless drill; it'll remove the decals for you. Available at body shop supply stores. If your decals are flaking that bad they will prolly come off pretty easy.
On my hdt (one in my sig); I bought the decals from the 5th wheel company then had a sign shop install them on the truck. $200 for them to-do the full install after I had the previous decals off the truck.
Also remember that you can switch up your new decals. Cyclone for example lets you order exactly what you want; guessing you could do the same with your raptor and adjust your decal price if you wanted to.