I have only one product set up right now, and it is Zero price.
It's actually the redemption of a groupon-type deal that will be mailed out to them. So, it's already paid for, but we need to track it here.
The system is just presenting the item with the word "Free" and no option to buy it. I need them to go through the process of registering or logging in, and entering their billing/shipping address along with their voucher number from Groupon. Once they do that, we mail them what they purchased.