I am investigating one of your apps, specifically, the cost to renew the maintenance for another year. Could you direct me to this information?
To quote from the Atlassian Marketplace:
Renewal, upgrade, and academic license types are automatically calculated and set based on Marketplace rules. Academic licenses are 50% off of the commercial license price. Maintenance renewals are always 50% of the original license price.
Looking at the Atlassian Marketplace listing of the app, you can then calculate the renewal cost.