In the past there were not many books in Lao to choose from, for the foreigner who wants to learn the Lao language. However, over the recent years, the non-profit organization Big Brother Mouse has published a large amount of easy-to-read books, which may just appeal to the beginner and intermediate learner. You'll find samples of most of the books on their website.
Unfortunately you cannot buy any of their books online, you will have to visit the stores in Vientiane or Luang Prabang.
I just wanted to share this with you, as I believe it might be a good resource for the people interested in learning Lao language