What can I buy my boyfriend for his birthday?????

Video game? Like if he has a favourite game in particular または favourite character then あなた could buy something related to it, that's what I've done.
I dunno, I haven't shopped for a boyfriend but when it comes to my brothers it's either video games または car stuff. または a nice シャツ または bodywash/colognes.
または make him something, that's always best ^^ Just something that is special between the two of you~

Honestly though, guys aren't hard to ショップ for, I find girls もっと見る difficult to ショップ for :P

For some reason i read this in the beginning as 'Where can I buy myself a boyfriend" xD
anyways, yeah, video games he enjoys, right on.

I am not sure how anyone is hard to ショップ for. Just pay attention to things they like. If あなた know them decently well it should be relatively easy. Video games,car stuff,movies,comic books,sport paraphernalia are among the stuff guys tend to enjoy.

your the only one who should know what he likes または not
i mean we don't know the guy.....how are we supposed to help not all guys like same things

Guys aren't any もっと見る difficult than girls. The idea is to not worry about his gender and buy based on his interests. If he's into music, あなた might look into getting a CD for some of his お気に入り musicians. If he's into art, get him artistic media.
I used to buy my ex お茶, 紅茶 because he wanted to try as many different types of お茶, 紅茶 as humanly possible, so I would go and buy him obscure お茶, 紅茶 types. I even remember sending a box of American Breakfast お茶, 紅茶 all the way to Ireland for him to try.