How can a mainland Chinese buy from Amazon using bitcoin

[hl5460]

Due to difficulty in distinguishing fakes and trust in quality goods that were not made in China, many Chinese in mainland are spending money on overseas goods.
However, many goods denies shipping to Chinese address. 

I understand that  viabox.com offers forwarding address.( but the process of obtaining US phone number is really annoying)
But I want to get the 20% discount offered by purse.io.

Is there any way to combine the two so that I could get anything on Amazon and discount at the same time?