ok here is what I got back from the decal shop at FT Leavenworth, a 3"x5" will be $1.44 a piece for a qty of 1-50, $1.36 a piece for 51-100, $1.28 for 101-150, $1.20 for 151-200. Vinyl or mylar are the same price they can do reflective as well but that will add about 50 cents a decal. They can also do magnetic as well.
No extra charge for art-set up, cutting to shape of image, or color changes. Print as many colors as your design requires.
Turn around is running 7-10 days at this time and if you have a decal you would like I can have it done on a 1 sticker run for roughly the same price.
If that works let me know and we'll get something started.
Follow up post:
Hell if you want the decal as a sunstrip on the top of your windshield they can do that for $26.91. lol going on the theory of a 48 x 6 sticker...