Mine hasn't budged in two years. I use HD steel pipe though because I had some around the house. Probably can find something cheap at tractor supply or home depot that will work. If not, just tell the wife that you decided to plant a couple new fruit tree's in the back yard.
I got 3" steel fence post, will these do? Set in concrete.
Yosemite Sam: Are you trying to make me look a fool? Bugs: You don't need me to make you look like a fool. Yosemite Sam: Yer deerrrnnn right I don't!