If you want to get the best deal when buying Euros, you should keep in mind the mid-market rate. This is also known as the spot rate or interbank rate. This is the fairest possible exchange rate you can find.
Unfortunately, currency exchange services will not offer you the mid-market rate. They’ll instead advertise a rate lower than mid-market, the difference being due to the commission they’re adding in. So discredit any claims of ‘zero commission’, as this extra charge is being disguised in their exchange rate.
To help ensure you receive the best exchange rate in Dublin, you can keep a close eye on the rates by checking an online currency converter.