Very unlikely that you will get anyone in this forum to post you seeds.

There are quarentine issues involved with exporting/importing live biological materials. When exporting them from Australia we are legally required to comply with quarentine restrictions of the destination country before we are granted an export permit.

I suggest you go through the official channels of the USA and contact a reputable seed dealer that is setup for exports.

There are risks of importing unwanted plant pathogens (viruses and fungi) as well as Australian environmental weeds.