American Printing has a site for secure file uploads.

Instructions
Please send an email to prepress@ampub.net and include:
A subject line with a name for the order and your name, or your company’s name.
In the email, please give a brief description of your project, or a reference to a current job.
If the file is small enough to email, you may attach it directly, or feel free to use our file server link below and include the name of the file you are sending in the email:

Please click here for our drop box at AmPub.net.