I recently got one from "Shaw Scientific" for £109 + VAT.
I'm told their prices may go up as they have realised this
is cheap, but will still be quite good. It is full size
and comes with a stand. The casting detail is is quite good
and it is absoloutely fine for teaching. I knoe there are
far better ones available for researcdh level work.
Their web page is at http://www.shaweducation.co.uk/
and you are looking for "human plastic skeleton A10"
Alan K. Outram BA MSc PhD MIFA
Department of Archaeology
University of Exeter