150 for taillights?

WHOA thats HIGHHHHH. Why don't you find a local paint shop that can do it for cheap. Best way to do it is to go to a paint shop and buy your own paint materials and then pay someone else to do it. I bought my black paint and clearcoat etc for $12 and then paid someone $20 to paint them.
 
My buddy bought projector headlights for his Focus. It replaced the huge headlight with a black panel, each having two round lights. They had more surface area than the tails on your Mustang, and Maaco scuffed, primed, and painted for $65, with a five year warranty.
Brandon