@CeCe ****
Depends on your passport but was $40 US dollars for us from NZ (or
*********
baht).
You need a photo (passport size, don’t have to be fussy about measurements) and a spare page in your passport for your VOA. It’s very easy, like other arrival cards. Don’t need to pay anyone to do it for you (as there might be people offering that service). Go straight to the window and fill out the form yourself.
If you do evisa it is $50 US dollars but both times I went to the friendship bridge at Nong Khai/Vientiane there was no long queues to do it on arrival. We got there around 9:30 am.