I first met Sarah Jane Morris when she rolled up to an EcoStiletto party in her biodiesel Mercedes—and confessed that she’d spent the morning dumpster diving for biofuel with her rock-star husband. I thought she was the coolest girl on the planet. Eight years and two kids later, the former star of “Brothers and Sisters,” soon to be seen on NBC’s “The Night Shift,” is even cooler. Especially now that she’s taking the Shop Drop Challenge with us! Sarah shared her philosophy on shopping, swapping and her favorite place to score preloved fashion in this Mommy Greenest exclusive.