I'm really just doing this to test the eCommerce suite that calguy1000 built, I was having problems with it for while but I think I figured it out.

The only reason they have a price of 1¢ is so PayPal gateway will work, guess they don't sell anything for free. They don't cost anything and there is a link at the end of the invoice page if you use the manual button and in the email you get in the end or just in the email if bought through the PayPal link.