@Jared ********
Yes, for some reason, the Vietnamese consulates only take USD, even though Vietnam is now an entirely VND economy with a stable, though low value currency. The Australian consulates charge in Dong, not AUD or USD in Vietnam. It's interesting that the Thais are only taking USD there, but fortunately, it's easy to obtain. Just go to a moneychanger in town and exchange Dong for USD to pay for your visa.