2DS/3DS/DSi power adaptor | Base | £5.99 (save £1 vs Amazon)
This isn't the most glamorous or exciting deal we've ever posted, but a console is just a paperweight without power. Doubly so for the 3DS and 3DS XL, the latter of which doesn't even ship with an AC adaptor as standard. Luckily Base are on hand with the official version for a competitive £5.99, saving you a quid on a replacement or spare. Households with multiple 3DS/2DS units may also want a backup.
Thanks to oUkTuRkEyIII @ HUKD!