Does anyone know where you can get ridgepole sleeves to join 2x4 together to make them longer, which won't break the bank, $40 for a metal sleeve seems steep to me. I know Panther Primitives have them, but they are about $42 each. Or even something else that is easy to set up, I suppose one could make something out of wood, but I don't know a plan that would be sturdy enough.