If you have large garden or grange stores you can check for big pole sized stuff with the nodes well spaced, I've heard of that route working but have yet to do it myself. I imagine it would still be a fairly spend route, but you'd get the experience of making the back ins which is a great one to have, and I'm sure you'd get at least to, maybe three or four depending on the pole. I do remember hearing on here that you want to make sure its a certain type of bamboo, but I seem to remember that was more for 40# and up stuff? Moso I think, anybody?