Designs that include foil stamps are noted by a Foil|Stamped tag above the preview of the card on the details page. Also on the details page, you’ll be able to see the price of the foil stamp mentioned as well below the dropdown for quantity.

 

If you have found a design that you would like to add a foil stamp to, please contact customer support to make the change for you. There will be cases where this isn’t possible, and we’ll let you know via that avenue.