What should I get my boyfriend for his birthday?

My boyfriend is amazing and so sweet. He has some money so he buys me a lot of nice jewelry. He gets me these things just because he feels like it. I want to give him a nice present like he does for me but I can only spend $150. I'm one of those people that thinks giving presents is awkward. I want to get him something nice but not lovey dovey gushy gushy. What do I get him?! Help!