I really need some ideas, please help me? boyfriend's birthday...?

okay so my boyfriend's birthday is coming up this month on may 21. he's extremely hard to buy for so i have no idea what to get him. [he's turning 14 by the way] i want to get him something acceptably expensive. for my birthday, he got me a $60 build-a-bear. [which i love] so i really wanna do something special because he made my birthday thee best birthday i've EVER had. No exaggeration. I'm making him a scrapbook card, baking him a cake, and im gonna have balloons delivered to the school for him. but im saving up my money to get him something BIG. Any ideas? please help me... i want this to be thee best birthday he's ever had... just like he made mine.