It seems that your location is not stored with your Apple ID but by a cookie from the iTunes/AppStore website that persists until you take action to change it.
For instance, I changed my location to Hong Kong [English] and navigated to a game picked at random
https://itunes.apple.com/hk/app/deer-hunter-2014/id583222866?mt=8
the prices are in HK$
at the bottom right of every page there is a country 'Flag Button' (like a campaign button) - here is an example of HK
Tap that FlagButton and choose Canada on the resulting page
If I navigate back to the same game
https://itunes.apple.com/ca/app/deer-hunter-2014/id583222866?mt=8
the prices are now in $ (Canadian is 'implied')
You can tell that you are in the right country by the URL location =
... apple.com/ca <-
instead of
... apple.com/hk <-
AND of course, the FlagButton bottom right of every page
Happy Christmas
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