Problem with those sites is that they just give you an idea of what you will get. Commercial banks are giving less than the rate oanda quotes. The official rate listed by the Central Bank is closer to what these are buying at. Exchange houses will offer a few points more, but these rates will differ from place to place. We post the lower Central Bank rate as reference. We also feel it is better for people to have lower expectations, so they are not disappointed when cashing at the banks, and feel good about getting more from the exchange houses.