There is a website that sells the hanging half mannis. I cannot remember the name right off but I know that I have it saved. I will look for it. They are really cheap too and a lot of the people on ebay use them (they talk about them on the ebay boards).
I have a dress-making mannequin, and I have used it for a few of my dresses that I've sold, but most of the ladies clothes I sell are too small for the form (I've got a large-size one), so then I lay them out.