With Peavy, Smoltz and Buccholz all on the DL I've spot started 3 SP each day over the past week and then discarded them overnight.
I've done ok so far
Monday: Lester (kept him), Wellemeyer, Bonser
Tuesday : Campillo, Cabrera, Hendrickson
Wednesday: Eveland, Rasner, Kuroda
Thursday: Kennedy, Wolf, Laffey
Friday: Olsen, Galarraga, Lowe