I agree with Indigital on the game idea. Perhaps a gift card to a store that specializes in video games. That way, he can pick whatever game he wants and it'll be less of a hassle for you if you were to buy a game, and he already has it, or something of the sort. That, or maybe even clothes. I know that 'clothes' are usually deemed as a gift for a girl, but these days, I constantly hear 14 and 15 year old boys obsessing over clothing stores, what they're wearing, and clothes in general. If you know his style and favorite stores, you could always go and buy him something you know he'll like.