19th Birthday Gift for my boyfriend! ($100 max)?

You don;t want to get him a gift card because it will show that you haven't put any effort into it. Go see a movie or have fun at an amusement park. You can also give him a handmade card. :) I like to put pics of my friends and I having fun. Or a picture frame! you can get those digital ones which play numerous pictures. He'll never forget you that way.