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Here's the prices on Amazon.com:

Kindle Personal Documents Service Fees

There is a document processing fee for the Kindle Personal Documents Service when you do not use Wi-Fi or USB. Fees for the Kindle Personal Document Service via Whispernet are based on the size of the file submitted, your country, and where you're accessing Whispernet. If possible, we will attempt to deliver via Wi-Fi rather than Whispernet, and no document processing fee will be charged.
Note: Kindle Personal Documents Service doesn't charge fees for delivery of personal documents to Kindle devices over Wi-Fi or to Kindle reading apps.

--Kindle device users living in the United States: Kindle Personal Documents Service fee via Whispernet is $.15 per megabyte domestic and $.99 per megabyte international.
--Kindle device users living outside the United States: Kindle Personal Documents Service fee via Whispernet is $.99 per megabyte.
--Aggregation of fees for Kindle Personal Documents Service: If you send multiple documents for conversion, consecutive orders that cost less than $5.00 may be combined into one transaction and appear as a single charge.

Shari