What to get my 17 year old boyfriend?

So my bf and I have been dating for over a year now. Last Christmas, I got him a digital photo frame, and a wristband from ALDO. The wristband because I liked it, but I got him the picture frame because he was always complaining about how he didn't have enough pics of me. Anyway, I'm completely at a lost on what to get him this year. He likes videogames, science (astonomy), music, books, nice clothes, and he loves electronics. My budget is $100, does anyone have any suggestions? I was thinking just putting a basket of stuff together, but idk...