5-seat team plan would likely be best. You need a license for each user creating forms (you could also individually buy 5 individual Plus plans)
Does the “license for each user creating forms” cost anything over and above the plan price?
We’re nearly ready to purchase the 5 – seat plan but it seems to have disappeared from your website. Any suggestions?
No, the price includes everything.
We had to take the Team plan down because the system used to manage the accounts is no longer supported. You can just buy individual Plus plans - you won't be losing any functionality. Each person creating the forms should purchase using the email address (Adobe ID) they use for FormsCentral.
Sorry for the slight inconvenience.