Do you know how to negotiate a video contract?

There is more to your contract than just price and delivery date.  You should consider thing like copyrights on source materials, music, and stock footage, the lifespan of the video, and the likely audience.

You also want to consider updates if they are likely needed.  Negotiate for their provision first; you will get a much better price than if you wait until updates are critical.  Often, significant changes can be done for relatively little, compared to the original video cost.