Best Buy is having a weekly sale for all Sims 3 games, including Showtime Limited & Katy Perry Editions! If you need another game, why not get it free with Showtime?! Sale ends March 10th.
Thanks to AznSensei for the info! 🙂
It seems that the actual deal page does not have Showtime listed, however this may change after Showtime is released. I will keep an eye out on it! Thanks Kebechet!