CloudFront invalidation pricing can surprise teams new to the service. The first 1000 invalidation paths per month are free, but beyond that each path costs money. This article covers strategies to minimize invalidation costs: using versioned file names for immutable assets, narrow path patterns for content updates, and Lambda-based selective invalidation. We also cover Cache-Control headers, TTL best practices, and when to use CloudFront Functions or Lambda@Edge for runtime response modification. Real cost breakdowns from production workloads illustrate the impact of each strategy.