Spending the night in Laos normally should not be too expensive. In some places it will even be difficult to find luxury hotels. In Luang Prabang or in the capital Vientiane there are some luxury options, but outside of these cities, you should be prepared for less luxury.

Here are some links to good site, that give an overview of the accommodation that is available.

• Vientiane
  
• Luang Prabang
  
• Vang Vieng
  
• Pakse
  
• Champasak Stad
  
• Si Phan Don (Four thousand islands
  
• Salavan
  
• Addresses all over Laos