First of all, it is important to be clear about the type of promotional film, length, copywriting is customized, shooting cycle, shooting the need to be aerial photography and other special requirements, post-production is three-dimensional animation production or other, etc., will affect the cost of the promotional film.
Every family is different, there is no fixed, see the production program is not what you want, the price given is acceptable. Value for money is the most basic. These are just the views of the whole road culture media, I hope it can be useful to you.