book publishing - does it matter which country i get my ISBN?

Will getting ISBN from another country affect the sales or marketing of a book? If I want to sell my book globally? Do I have to get ISBN from other countries?

For those of you who have experience publishing your own book, do you always use a Australian ISBN? Seems like it is cheaper to buy a ISBN here than compared to USA.

But some countries like Singapore give ISBN for free.
 
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