The kill switch and FE decal can be probably be bought on the cheap at the track. Either your NASA trailer or a trackside vender will likely be selling those for $1 each.
The other decals can be bought from all sorts of outfits. Lately I’ve been getting my decals from Levent at TrackDecal.com. Speaking from lots of experience with receiving decals that weren’t what I had envisioned…you have to be careful that you leave no ambiguiety in your decal order. Don’t allow an email thread to develop thats lists various changes in each addition to the thread starter. So what you do is ensure that your email exchanges consist of a single set of guidance that is entirely correct, as opposed to a list at the bottom of the thread that is only “entirely correct” once the 8 other changes “above” incorporated into it.
Be sure to spec the size and color of each decal w/o exception. And it’s not enought to say things like “bumper sticker size” or “the same size everyone else uses”, that’s the kind of thing that causes screw ups.