Christmas gift cards

I have 3 adult daughters, one in college the other 2 are living in their own homes. It's pretty easy to find gifts for the two older daughters as they live close and I am good at listening for hints. When I asked my youngest daughter (21) what she wanted for Christmas she said something to this effect "food, I'm a poor broke college student". So true, but wrapping up a month's worth or groceries isn't very practical. I decided to buy a few of her favorite treats and attach gift cards to Target (they have food now) and a few other fun places.

How do you disguise your gift cards?