Of course you can get your Lao visa at most borders, and maybe even a bit cheaper. But that also means waiting in a cue. So save some time and get it in Khon Kaen when you are there.
They are open from Monday to Friday from 8:30 - 12:00 and from 13:00 to 16:00
Service is quick and efficient. Just fill in the application form at the desk, give your passport with 1 pass-photo and the required visa fee. And within 5 to 10-min you ready and set to go.
Surprisingly even with the current exchange rate of the US$ the price in THB is still the same.