PS Vita [Wifi] – £76.46
PS Vita [Wifi] – £76.46 delivered
Apply coupon “JANUARY2014”.
Preowned.
Note: Does not come with a charger, you can get one for just shy of a tenner here.
Edit: You might prefer to get the 3G model with a charger for £99.99 here.

Chargers are £5 in Game.
FYI you can grab a USB charging cable from Game right now for £1 (normally £4) in store if you would rather have that
There’s that too but the Vita charges much slower via USB and doesn’t charge while the gizmo is switched on.