You can generally find them at any of the farm stores in our neck of the woods. Most of them will let you sort through the bundles for sizing once they've been opened. Usually run about .25 a shaft for the 4' to 6' lengths. I've found them at Bomgaars, Orshelin's, Home Depot, Tractor Supply, and K-Mart. Wally World probably even carries them this time of year.