Lowes or Home Depot for posts. You can use regular steel posts or wooden, but you have to dig them down quite deep so they hold the weight of clothes. I happen to have 2 huge trees just the right space apart , and I have my clothesline wrapped securely around them and tightened. I hang shirts and sheets on the line,,do not care for the way jeans or towels dry on them, they get too stiff, even when using fabric softener. I am holding off putting anything out there now, until the cicada's are done, lol!