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Good question.

"Storage consumed by your database, up to 64 TB, is billed at $0.10 a GB per month and IOs consumed by your database are billed at $0.20 per million requests"

Sounds like the replication is included in this, but Amazon really should clarify that.

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Based on how Amazon's pricing tables are, it should be included.

If you go to the normal RDS pricing, there's "Single AZ" and "Multi AZ" pricing. The Multi is 2x Single because it transparently runs the 2nd instance. http://aws.amazon.com/rds/pricing/

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