Some videos of Murakami Megumi's dancing were posted a couple years ago, but there are more of them on YouTube now (she's in the center for both videos):
She is one talented lady.
This channel has a lot more of them (she's in the ones that have Meg in the title for sure, plus a few others).
on 3/15, Yaguchi Mari will be competing on a show shes very familiar with, "Tosochu (Run for Money)". She appeared on the show from 2007 to 2012 and appeared in the show's DVDs. http://www.fujitv.co.jp/tosochu/next.html