Gift ideas for boyfriend's birthday?

Hello, I am looking for ideas for my bf's birthday, we will be 1 year together soon and this is my first time buying him something, so I am unsure what he will enjoy. He is interested in history and politics, he likes motorcycles, Warhammer, beer, cooking, he is a researcher in plants. I thought of antics but they are too pricey, with books I'm scared he would've already read it lol. Any ideas?