Secure Shopping PHP MySQL??

Hello, I am trying to put together a small site with a few items that can be ordered. I have a secure certificate (SSL/https) that will house the site. I can not afford to pay the pricing of PGP for the server to encrypt form mail. I have not been able to get GnuPG to send an encrypted email message to a remote Windoz PGP client to be viewed. It doesn't sound like there is much support for Windoz products under GnuPG. Another option that I was thinking of was using PHP3 and MySQL. I would like the customer to order online via the secure connection and have the ordering information stored in a MySQL database. The customer could then go to a secure web page and view the order information and process the order manually. Is this possible? Any security concerns with doing it this way? Does anyone have any other *inexpensive* solutions to e-commerce using SSL, PHP, MySQL? TIA, Scott