Buy a Game Boy Micro for £30

Here. Play-Asia's selling the Famicom-coloured Game Boy Micro for £30, should you feel the need. That's not a bad price for something you'll probably never use. The machine's a very nice weight and size: a nice "thing" to own. And you can play billions of Game Boy games on it, assuming you're bored with your DS. Do it. It's only money.