Democrats Elizabeth Warren [D-Mass] and Peter Welsh [D-Vt.] have penned a letter to Amazon Clinic executives saying customers need more information about the handling of their private information. Amazon launched its Amazon Clinic last year providing a cheap, easy way for customers to get doctor’s prescriptions online, for as little as a $30 fee. Responding to a report in the Washington Post, the senators say customers may be paying a bigger price through the collection of their private data, and having it sod to third parties.