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Depends where you are. In Germany I have https://www.heubach-edelmetalle.de/ and in Australia I have http://www.perthmint.com.au/?gclid=CLDAp5rvudQCFRQFKgodDnkH0w&gclsrc=aw.ds, both have counter sales.

You can buy from JMbullion.com Great customer service!