Gift certificates can be bought to give as a present.  As soon as you click add to cart you will be prompted for the name and email of the person you are providing the gift.

These are in $20 multiples... e.g., buy 1 for a $20 credit, buy 2 for $40, 5 for $100, etc

The total value of the credits can then be used to purchase goods on the shop to the equivalent amount.