Upgrade to the yearly plan and save 15% off your whole team for the whole year. If you're a Team Admin, you can upgrade your team in your Organization's settings.
Go to your Organization. It's on the lower left-hand side of the page
Click Settings in the middle left; then scroll down to Upgrade.
Click the "Add/Update Payment Method" link and click through until you get to the credit card page. Select "Annual."
Your team is now on the yearly plan.