I've just ordered a Pokémon powerbank (a portable phone/tablet charger) from Amazon for DS. There's a Master Pokeball themed one for £6.78, which I ordered, or a Pikachu one for £6.12.
They are 5000 mAh / 2.1A, so suitable for charging 1 ipad or up to 2 phones.
DS will be over the moon. DH will be too, as DS will stop borrowing and draining his!
I also ordered a vibrating massage cushion for £11.39, also for DS who likes sensory type stuff like that. It's called the Funtime Massage Cushtie, which made me snigger a bit, but then I'm immature like that 
I also have a favour to ask @OhHolyFuck. If it's not too much trouble, would you be able to check your Pokémon money box and see if it works with 50p pieces so I can make a final decision between that one and one of the Asda ones? Thank you so much and please don't worry if it's all packed away and you're not able to.