I did some intensive research the last few days on vaccines and health risks when travelling in Cambodia. While there are no required vaccines to travel to Cambodia that are not already required in the US, the CDC does have a list of recommended vaccines and medication that you should consider getting depending on your trip. Link here:

http://wwwnc.cdc.gov/travel/destinations/traveler/none/cambodia#vaccines-and-medicines

I have an appointment with a doctor at UW next week to discuss what he thinks is appropriate, and what that would all cost. 

I'll publish a Part 2 to this when I get that information!