Just found this on Ebay if it's any use to you:
//http://www.ebay.co.uk/itm/Qualatex-Super-Stuffer-Balloon-Stuffing-Machine-balloon-expander-/261023468282?pt=UK_Home_Garden_Celebrations_Occasions_ET&hash=item3cc6360afa
//http://www.ebay.co.uk/itm/Qualatex-Super-Stuffer-Balloon-Stuffing-Machine-balloon-expander-/261023468282?pt=UK_Home_Garden_Celebrations_Occasions_ET&hash=item3cc6360afa