Starter licenses are FREE!
Note: Confluence TeamCity Integration plugin is free. You only need to purchase JIRA TeamCity plugin.
One year of support
You can use plugin after the support period has expired. But if you want to update it to a new version or receive support after this you should purchase license renewal with 50% discount.
Users number note
Your JIRA TeamCity Integration Plugin should be licensed to not less number of users than your JIRA instance