Thredbo has responded to the Perivail pass by joining the Mountain Collective, which includes two day lift tickets and half-price tickets beyond that at a number of US and Canadian resorts including Whistler, Lake Louise, Snowbird, Alta, Squaw Valley, Aspen/Snowmass, Mammoth, Jackson Hole and Sun Valley. Two day tickets at Valle Nevado, Chile and Hakuba resorts are also included. The Mountain Collective pass is a good option if you're planning a road trip in the US and Canada. I think that Thredbo would be working hard behind the scenes to make the Mountain Collective pass more like a season pass to be competitive with the Perivail season pass.