Was that visa on arrival? isn't the $24 just for the visa on arrival approval and then you also have to pay at the border for the "stamp"? Kindly clarify, thanks
It was just like this:
http://www.myvietnamvisa.com/faqs.html#125 USD for single entry
What is visa on arrival?This is an alternative way to get your visa for Vietnam. You just need to fill in our "Online Application Form", pay the service fee, get your "Visa approval letter" within 2 working days and pick up your visa at your destination airport (Hanoi airport, Ho Chi Minh city airport, Cam Ranh Airport Nha Trang and Da Nang Airport) -
After we obtain the approval letter for you, we will forward you a copy by email. Copies of the same document will be forwarded on your behalf to Vietnam Immigration checkpoints at International Airports only. When you arrive in Viet Nam, the Immigration officers will have those documents ready and will be able to issue your entry visa quickly. (See our guide to visa procedure at Vietnam airports)See Also: You can check out the information below for the detailed airport map where you will pick up your visa when you arrive.
Hanoi Airport Map - Hanoi airport visa-on-arrival counter.
Ho Chi Minh city airport map - Ho Chi Minh city airport visa-on-arrival counter.