China visa tourist 2 week travel

I have been told £151 on this forum, however I don't where I would apply for one for that price. Bargain for a 2 year multiple entry. I have contacted the CIBT and been told it will cost £260 minimum....big difference. Has anyone arrived in Hong Kong and purchased a tourist visa from the local agents? I have heard it is very cheap. I have to say that if I can get from the UK before I travel at £151 then that's great and a comfort but again cannot where I can get this from as it seems online web sites are showing £260.