Having lived here for a while, I have learned about the costs and having your visa extended or renewed, as you need to. First, if you wish to come here for more than two months at a time, DEFINITELY go with a business visa. That will allow you an indefinite stay in country. Another plus to this is, you can renew your business visa without having to leave Cambodia, indefinitely. And, a business visa gives you the privilege of being able to work in country. Typical pricing around town (Sihanoukville) is as follows: 1 month - $50 - single entry 3 month - $80 - single entry 6 month - $160 - unlimited multiple entry 12 month - $290 - unlimited multiple entry If you have a one month or three month visa, and decide to leave the country before thee visa expires, you will have to buy a new visa upon arrival. If you have a six month or twelve month business visa, you may come and go in / out of the country as you wish. HTH