Visa cost

What is the cost for a 30 day tourist visa for an Australian citizen at either Luang Prabang airport or the Tay Trang border crossing?
Thanks

It varies by nationality, and Ozzies pay $30USD as I recall, and it's the same wherever you enter. If you try to pay in other than U$D the "exchange" rate is outrageous! At some land crossings a small amount of "tea money" may be requested for "overtime" or whatever.