Money Changing Tips

As a frequent traveller round the region - I do 2 trips a month to Malaysia,Thailand,China and soon Indonesia- I have noticed that the Bureau de Change or Money Change Booths at the Singapore airport while they offer "No commission" on the money which you change, the 'spread' in which you buy and sell the foreign currency is wider than if you were to purchase at the
overseas airports such as KLIA or Suvhanabhum.
An example, at KLIA yesterday, the rate which CIMB bank buys S$ (you sell to CIMB ie. they pay RM) is S$1 = RM 2.31
And the CIMB bank Sells S$ (you buy S$ or when you exchange back from RM to S$) at RM 2.39 = S$ 1.00
So for a S$ 100 exchange you get RM 231 ;
When you change back you pay RM 239 to get back S$ 100.
So in essence the bank earns RM 9 ; or S$ 3.89 per exchange of $100 or 3.89%.
You lose RM 9 in essence.
In Singapore, a check at the local bank exchange shows RM 1 = 0.435 or Sells RM 2.29 for S$ 1
When Buying the RM, local exhange is RM 2.44 for S$ 1.00
The spread is then RM 15 or 6.5%
You lose RM 15 in essence.
Conclusion : Don't change foreign currency at Changi, change at the overseas airport when you arrive.