I've always wanted a dress form. I saw a tutorial somewhere on how to make one with duct tape that looked fairly easy. That is if you have someone you trust to tape you up and then cut you out. Plus then you'd know it was exactly your size and fit, not to mention it's not too much of an investment if you change sizes at any point.
http://www.craftster.org/forum/index.php?topic=28407.0theres one someone made and then made a stand for.
and heres another tute.
http://www.craftster.org/forum/index.php?topic=110282.0there are lots out there, not just on craftster.
Best of luck!