Tableau Pricing is pretty standard.
As you are willing to go for 100 users. You will need to buy 100 interactors.
One interactor for one user.
As Tableau doesn't allow concurrency. One to be used by many.
1 Interactor will cost $1000
1 Desktop will cost $2000
So your cost will $100,000
I would still recommend you to get in touch with Sales rep of Tableau for your region.
They can help you with this.
Hope this helps