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Well, the three I quoted were because the seller is in US, you're in AU and Orville is in CA.
If you feel really generous you can do the opposite of 'splitting the change' abandon all of this...

You can even go as high as $6, as Orville will give you a buck if you can make this stop :)
The only problem with the plan is that you may then have to spend a month arguing whether these are...