There’s no need to go to the Vietnam embassy when using the Landing Visa at International Airport of Vietnam. This visa can be claimed only at the airport of Vietnam. Once you have the pre-approval letter, you can fly to Vietnam and claim your visa at the landing visa counter upon your arrival at the airport.
It is quite hard to say how much for for getting a visa at the embassy of Vietnam. The price vary from embassy to embassy.
Are you looking for location of Vietnam embassy in Vanuatu 🇻🇺? We are sorry to announce that there is no embassy or consulate of Vietnam in Vanuatu at this moment. You are suggested to contact the nearest Vietnam Embassies in your neighboring countries.