What does "will not go unsold to" mean in the following sentence?

“The King of Portugal, Lord of Spices, has set... prices just as he pleases, for pepper, which, at any cost, no matter how dear, will not long go unsold to the Germans.”

Sourse: Bound Together: How Traders, Preachers, Adventurers, and Warriors Shaped ... By Nayan Chanda Google book link--- http://goo.gl/YPngmK

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What does "will not go unsold to" mean in the following sentence?

The King of Portugal, Lord of Spices, has set... prices just as he pleases, for pepper, which, at any cost, no matter how dear, will not long go unsold to the Germans.

Source: Bound Together: How Traders, Preachers, Adventurers, and Warriors Shaped Globalization, by Nayan Chanda 
Google book link--- http://goo.gl/YPngmK