Oh no! Not another money exchange question!

I always bring some $$$ when I come here as I have found that unless you take out large sums of money,the exchange rate at the banks may be better at the ATM but once you calculate the fees they charge locally and then through your bank,you end up with a worst exchange rate than bringing $$$ and exchanging here with no fees for doing so.I ended up going at the ScotiaBank in Centro and they gave me 11.55 which was the same rate they were giving for the US$.Tuesday at the airport,the outlet there was giving 11.25 for Canadian$...Thank you all for your replies!