Out of stock anywhere I can see bar one seller on Amazon who is charging well over the odds (and about whom I feel a little dubious anyway given the complete absence of it in any other online shop).
Out of stock at Tesco.com (and local Tesco), elc.com (and local ELC), mothercare.com (nearest actual Mothercare is a bit of a drive so haven't looked there yet but it's on my list), play.com, ToysRUs, John Lewis, Toymaster, Argos online and all my local Argos stores...