Double Jogging Stroller

So we have this new sidewalk really close to our house that goes all the way into town. I want to start walking again but find that very difficult to do with two little ones. So ... i'm looking for a double jogging stroller. If anyone sees one for sale at a consignment shop or in the paper or at a yard sale ... anywhere but brand new at a regular store ... let me know please. Ideally I would like one that converts to a bike trailer but i'll settle for one that doesn't if it's cheap enough.