I have done exactly that. I'm using "TravelIndochine" ([email protected]) that quoted a rate of $20 each way. They use a seven passenger mini-van. They indicated in their e-mail that their driver would be seeing me at the airport with a hand held sign with my full name written on it. I am to pay the driver in US cash before leaving the airport. It sounds like a fair deal to me and takes some of the anxiety out of the transfer procedure.