Flash drivePeople always need to transport or save data somehow, why not use flash drives.
Average price: 6 $
EbookA better way of reading and storing books.
The price for an ebook varies a lot, but you will find a bunch of them under 50 $
Video gameGames are a good way to entertain yourself.
You will find all kinds of prices for games but mostly they are under 50 $. Or maybe the person already has a game he/she likes and you can just get him/her an expansion, which is also good.