We flew from Siem Reap to Ho Chi Minh where we were flying directly on to Singapore on Jetstar. We were informed that we would need a visa for Vietnam even though we were in transit as we would have to collect our luggage and check in again at HCM. We were charged $200 each to have a Vietnam visa arranged to collect at HCM on arrival there. We were not going to be allowed to board our flight in SR so had no choice other than to pay up . There was a man waiting for us on arrival at HCM and we got the visas collected our bags and checked in again all without leaving the airport. Has this happened to other travelers? It cost more than the flight! This was the only sour note after spending 3 lovely weeks in Cambodia.