Whole Foods in Marlton (73 and Greentree) has some sort of filtered water for 49¢ per gallon. I've heard it was RO, but I couldn't tell from the markings on the dispenser and didn't have time to ask. There's a place next to TCBY in the shopping center at the intersection of Church, Church and Maple in Marlton called The Water Boyz that sells RO for 80¢ per gallon. I'm going to try that this weekend.