We bought it direct from Nickelodeon just before she was born; they stopped selling it for a while but it's back now, which is great because it had been very expensive: http://www.shopnicku.com/product_p/7342761.htm
(This doesn't look exactly the same as ours, but I think it's close.)
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(This doesn't look exactly the same as ours, but I think it's close.)