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You can import seeds I think. Or maybe those people are not in the US.Budwood of citrus shouldn't be able to come through at all, even with USDA inspection. You wouldn't be able to get the import permit in the first place which is required for mailing any budwood from the source to the USDA for inspection.
The disease risk from Australian budwood is very low as many of the worst diseases like greening are not here and any ouitbreak would be contained quickly. Getting budwood in is almost impossible.