Available at: Impress http://av.watch.impress.co.jp/docs/news/20101021_401501.html ($85)
Available at: Thinkgeek ($20) http://www.thinkgeek.com/interests/giftsforher/a620/
I suppose if you can't afford a butler to twirl your ice cream for you, an automatic cone will have to do.
Available at: Megahouse http://www.megahouse.co.jp/megatoy/product/girls/deco_pocky.html (in Japanese) ($15)
The only way this could be better is if it also played "Endless Love". (+100 internets for catching the reference)