It's common practice in HK to sell the item you've researched at the best price and then completely shaft you on the un researched second item. I was done many years ago on the spare battery for a camera I just bought. Luckily only $100 or so but learned my lesson. Plus never think "your guy" won't shaft you the second he knows you haven't done your research.
Other classics are selling old stock as the latest for only $200 more than what your looking at when it should be $500 less.
Or just go to fortress.