We just got back. NCL took care of the visa for Sihanoukville. It was only $30/pp, so if Oceania is charging $89, that's simply a rip-off (and I thought NCL was nickel and diming everything, lol) We also flew to Siem Reap for 2 days. We did the online evisa for Cambodia, that was super easy, we also got our tickets to Angkor Wat ahead of time to save time. If you are looking for a tour guide for Angkor Wat, we used San Park. He was absolutely amazing!!! I would highly recommend him!