Microsoft today began selling additional space on its OneDrive cloud-based storage service to customers who subscribe to its consumer-grade Office 365 plans.

The extra storage starts at $2 per month for 200GB and climbs to $10 per month for 1TB (terabyte). The additional support is available only to customers who already subscribe to Office 365 Personal or Office 365 Home, the two consumer-targeted plans whose primary benefit is the right to run Office on Windows or macOS.