I would guess the spray cost varies by place, by quality but also by the colour as a flat paint is bound to be cheaper than a multi layered metallic or the like.
I am a fan of wrapping, but given the Zeds paper thin paint, I was always concerned about what would be left on if a wrap was removed. It is a strong adhesive so would it pull at the lacquer that is on the paintwork underneath? Also, when polishing my black Zed, I loved to get that mirror finish, most wraps wont get you that.