Hey, if you go to xda developers or android central, i have a guide on both of how you can root the phones. It's through a very weird workaround, but it's the only known way to root them as of right now. Some people have posted that it didn't work for them, but I've mostly fixed that. Here are the links:
http://forum.xda-developers.com/showthread.php?t=1545112
http://forums.androidcentral.com/samsung-replenish/161476-my-root-guide-stock-2-3-6-replenish.html
http://forum.xda-developers.com/showthread.php?t=1545112
http://forums.androidcentral.com/samsung-replenish/161476-my-root-guide-stock-2-3-6-replenish.html