The lenses you need to shoot your video will depend upon what is called for in each scene of your script. The 18-55 mm may be all you need, but if you find you need more lenses, consider renting them for your project.
Here is a link that shows you what each focal length lens "sees". Using it may help you decide which lenses you need for your specific project
NOTE: What you seem to be asking is how to find third party lenses like Tokina, Tamron, Sigma and others. Amazon.com has many different options, once you decide which focal length lens(es) you need
The lens you need for shooting landscapes is either a 10-24 mm or 12-24 mm. And yes, those focal lengths in Nikkor lenses cost just under $1,000
Tokina makes a fine 12-24 mm lens which cost about half that