We are keen to use Amazon Instant Video. I have Unblock-US set up and working fine and have entered US addresses etc on my Amazon account and changed my country location setting to US. However the final hurdle is that (unlike Netflix now) they require a US credit card even though my BNZ Visa works fine for ordinary Amazon purchases. 

Have tried the so-called fix of putting the Amazon account into credit by buying myself a gift card and then deleting credit card details - but that does not seem to work.

Has anyone found a solution for this?

Cheers