I have noticed that there is a significant difference between the prices charged for some vaccinations. For example, the Twinrix Junior vaccine (Hep A & B) - at Dr Lucy Lord's it costs $700 and at Quality Health Care (Dr Elsie Lim) the same vaccine costs $400. Aren't vaccinations in Hong Kong standardised (ie: of the same quality)? Has anyone else experienced this? Do you think it is the same vaccine or a different version? All information helpful. Thanks!