Thanks for the clarification....I think I may have the answer now.

Could you post the item number so we can check for sure?

I suspect that the item was listed with Global Shipping, whether the seller realised it or not.

The seller gets paid for the item and any postage within the USA.  The rest of the postage and charges (including the GST) goes to Pitneey Bowes who arrange the shipping internationally once they receive the item in KY.

If the seller refunds you without a dispute being opened he can only refund what he received.   If an official dispute is opened by you, it should also trigger a refund of the money sent to Pitney Bowes for the international postage, fees and GST.

I agree with Springy.....the $30 voucher is co-incidence.  I had the same one that expired on 31/10 and yesterday I got another one for the same amount.  lol

Just a tip....if you want to join ebay Plus wait till the voucher goes up to $50 and cover your year's subscription in one go.