I bought Samsung Galaxy S5 clone a moment ago , I don't keep in mind which link I bought from, perhaps this one-
Could you specify if you are u looking for a real galaxy s5 or just a more authentic clone? If its just the first, direct from samsung would be most safe.
Hint the price is should at least be 600usd+
like this one
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Lastly, I did not notice a forensics question. Did I happen to miss something or was that all you needed?