Actually, unless your planning on making a huge profit, PayPal was exactly what I was going to suggest!
It is absolutely perfect if you want a quick and easy eCommerce web site. You don't need and PHP or Java, the only small peice of code you'll need is provided by PayPal. PayPal is also the most popular and secure. They even provide you with a configurable shopping cart.
Just logon to PayPal as normal, and click on the
Merchant Tools tab. Take a look at the "PayPal Shopping Cart" section.
The only downfall with using PayPal is that you are stuck with their percentage of any payments made as usual, but most of those fee's would normally be spent worrying about credit card security and such. You also won't need to worry about coding your own shopping cart, setting up a CGI-BIN, secure server etc.
EDIT: Marked as answered.