Why don't you make one using schedule 80 PVC pipe. Take a 4" diameter piece about a foot long... drill two holes in it, one at each end for a shackle, cut a slot in it and add three brushes to the interior. Add a weight to one shackle, a line to the other...
Probably cost you all of $25 to make, including the shackles and line.
Probably cost you all of $25 to make, including the shackles and line.