Naruto: Shippuuden - Season 1 Episode 27 -

It's the final stand against Sasori, and Chiyo reveals the flaw in Sasori's "immortality". As Sasori breathes his last breaths, he rewards the two kunoichi for his defeat by providing them some valuable information. In ten days, they will have the opportunity to meet with one of his spies who can provide them with information on Orochimaru, and Sasuke as well.