Victoria Kjos posted in another thread about getting a visa at the thai consulate in Vientiane.
So from reading prior posts, you had to have a certain amount of USD to buy a Laos visa upon arrival is that correct?
And, you applied in a.m. and picked up visa next day is that also right?
Sorry, I'm a "newbie"...my first experience with the JOYS of the Thai visa system. Was planning to go to Burma, but this sounds perhaps easier.
TLDR : Answer Summary
To obtain a Laos visa from the Thai consulate in Vientiane, you do not need US dollars; payment can be made in Thai baht. The application should be submitted in the morning before 11:30 AM, and you can pick up your visa the next afternoon after 1:30 PM. However, using US dollars for the visa payment might be cheaper compared to paying in baht, especially for Europeans.