I thought the same, ran out of time to make it to vietnam anyway, but as far as i found out visa on arrival is not an option. You can get it arranged in thailand/cambodia/laos etc and through travel agents in SE Asia when you are thee, but you need the visa before you arrive.
You can arrange a visa on arrival, but you have to arrive at a specified point of entry. It's a bit of a ballache.
You can board a flight to Vietnam without the visa, as long as you have the documentation showing that you're collecting it on arrival.
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