When you buy through this site your payments are processed via PAYPAL. PayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. It's is a subsidiary of Ebay, an even bigger ecommerce internet company. In fact, regarding its size, Wikipedia said the following:
On April 18, 2012 eBay reported a 29% Q1 revenue increase to $3.3 billion compared to their Q1 in 2011. Net income was reported to be at $570 million for the quarter.
So the financial engine powering the transactions on this site is not a small one but one of the standards of the internet. PayPal is always free for you to make a purchase on this site. You don't even need a PayPal account and you can pay in any of 25 currencies (not a big advantage admittedly since we don't ship outside North America). People all around the globe trust PayPal to help protect their financial information.
You can pay for your transaction with either your credit card or via your Paypal account: