You can find pricing information in a few places throughout the process of creating and sending your card. When you're browsing design templates, you'll see pricing information displayed when you click to enlarge any template preview.
Once you begin creating your card, pricing information will be displayed in a menu at the top right corner of the Customize page - this menu can be opened to see an itemized list of costs per recipient.
When you're creating your recipient list, a running cost will be displayed at the bottom of the Add Guests/Recipients page next to the "Send" button. This cost will be updated each time you add a new recipient, since the cost of your card is largely based on how many email addresses you send to.