Fares fluctuate daily. Grab good deals (40%-60% discount off published fares) from agents. Lesser discount on or near the departure date. Don't buy them at the airport - much more expensive.

Contrary to what is usually advised, do agree on the taxi fare before the ride (especially if your destination is quite a distance away). [Prior to hailing a taxi, you would have checked the estimated fare for your destination]. Locals will tell you that this is the best way not to get cheated. If you follow the metered fare, the taxi driver could bring you 'round the world' and you would never know for sure whether he is taking the correct or a 'crooked' route.