Christmas for New Boyfriend?

My boyfriend and I have only been together for about a month. But he's talked about Christmas presents a few times and I don't know what to get him. Keep in mind we are in high school and I don't have much money to spend. But I don't want to get him something silly and feel bad when he gets me something really good. Any recommendations? I actually already have made him some letters, the "open when" letters. But I want to get him something else.