We bought our mannequins at Z&L from Pinneberg, Germany. Good quality, nice prices, very correct shipping fee.
Perhabs take a look at
http://www.ebay.co.uk/itm/ZNL-Full-F...YAAOSwGotWnKvS
And they have a lot of more mannequins.
Our third one we bought at Marks&Spencer in London. They had one with a broken shoulder and we pay 30 pounds. Few years ago, as we lived there.
Perhabs ask if a shop is nearby your home.
Hope you find yours one soon. All the best.