Community Membership = Free for one (1) authorized user
Collaborator Membership = $5/month for one (1) authorized user
Professional Membership = $10/month for one (1) authorized user
Organization Membership = $20/month for up to three (3) authorized users
If you'd like to have more than three people on your membership, you can add additional members to an Organization Membership at the rate of $2.50/month per additional member.