Thanks all for the speedy replies!
And a HUGE thank you to Nostrum!
I went with your idea and got myself over to our local Goodwill shop and what do you know I find a multitude of used computer/desk chairs. ^^ The one I got even has a dial to make the chair lower or higher. And for $11, you can't beat it.
So after harvesting the seat part to use for future cosplays, I now have a wheeling, height adjustable mannequin. Made for a whopping $11. (In your face, expensive dress forms!)
Thanks again Cosplay.com forum dwellers!