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

Video game? Like if he has a favourite game in particular or favourite character then you 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 or car stuff. Or a nice shirt or bodywash/colognes.
Or make him something, that's always best ^^ Just something that is special between the two of you~

Honestly though, guys aren't hard to shop for, I find girls more difficult to shop 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 shop for. Just pay attention to things they like. If you 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 or 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 more difficult than girls. The idea is to not worry about his gender and buy based on his interests. If he's into music, you might look into getting a CD for some of his favorite musicians. If he's into art, get him artistic media.
I used to buy my ex tea because he wanted to try as many different types of tea as humanly possible, so I would go and buy him obscure tea types. I even remember sending a box of American Breakfast tea all the way to Ireland for him to try.