Today, AWS Marketplace added a feature for Amazon Machine Image (AMI) products that allow customers to purchase contract terms for 1+ years and helps them to secure the best price for their commitment. This feature is available through Seller Private Offers and makes it possible for customers to negotiate contract terms, price, and spread their payments over the duration of their contract. Once a customer subscribes to an AMI product, they can track details on usage, completed, and upcoming payments through their monthly bill from AWS.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/05/aws-marketplace-enables-long-term-contracts-for-ami-products/