I was in Vientiane a few days ago with some time to kill, so I found the national postal service (Entreprise des Postes Lao - EPL?) head office who gave me a printed copy of their EMS international rates.

They're currently available for users of osCommerce or Zen Cart by using the shipping modules (links in the article are for the *latest* release) from spider.my:

osCommerce shipping module for spider.my (Pos Malaysia rates) pre-release

The destination coverage should be good enough for most e-commerce businesses, but isn't as complete as you might expect it to be. When I converted EPL's zones from their shipping tables, I included only those countries they specifically listed). See the shipping world map for prices from Laos here:

Shipping Quote World Map