I can't help you find runners, but I can tell you they are incredible creatures! They are endlessly entertaining, can be confined with a 2-foot fence because of their tiny wings, and mine are easily moved about and/or returned to their shelter at night with the mere sound of a food container being opened.
Mine wander around loose during the day with chickens and geese, and none of my drakes has ever tried to mate with a chicken. They all will, however, nip at a hen if they think she's going to take their food.
Hope you get some runners!