check out http://www.MannequinHub.com/ this link will redirect you to listings on amazon.com, its hard to find what your looking for for under $80.00, but this is pretty close.Good luck!!
Just as a tip, I bought a mannequin dress form for $50 but the product was CHEAP as the price. The $50 mannequin didn t even last me for 3 weeks. I bought another one for $79 and I have had it for 6 months now (still good as new).... remember you get what you pay for! I m not saying spend $300 on a mannequin but if you can spend a few extra bucks and get something of quality, why not?I had bought my good quality mannequin from here:http://prettywomanwholesaleclothing.ecra��
http://www.mannequinland.com/google it, there are some great sites!
Regularly go round the back of your local department store and wait for them to put one in the skip.