what's the average price of shipping a 1 lb package to the UK?

How much money would I have to shell out for a medium size box probably weighing no more than 1 lb from USA to the UK. Hoping about 20$... is that realistic for a reliable shipment? And if anybody has experience shipping overseas, is it just like the usual shipping routine but higher cost? 

I'll reward the 10 points for best answer, would appreciate help, thank you.

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