The official page for Trello pricing is here: https://trello.com/pricing
On this page is the per user, per month cost - the big number is the dollar amount, the little number is cents.
Trello Enterprise is $20.83 per user, per month when purchasing for 100 users - which would be two thousand and eighty three dollar for 100 users ($20.83 x 100).
You can enter user numbers for Enterprise into this page to see what the cost is per user depending on how many licences you buy.
Business Class appears to be a flat $9.99 per user - so I would assume $999 for 100 users.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event